JPH1164525A - Fluorescent glass dosimeter - Google Patents
Fluorescent glass dosimeterInfo
- Publication number
- JPH1164525A JPH1164525A JP23776597A JP23776597A JPH1164525A JP H1164525 A JPH1164525 A JP H1164525A JP 23776597 A JP23776597 A JP 23776597A JP 23776597 A JP23776597 A JP 23776597A JP H1164525 A JPH1164525 A JP H1164525A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- fluorescent glass
- glass element
- reflected
- excitation ultraviolet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Measurement Of Radiation (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、放射線管理システ
ム等に利用される蛍光ガラス線量計測定装置に係わり、
特に、放射線被曝された蛍光ガラス素子に対する被曝線
量を高精度に測定する蛍光ガラス線量計測定装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent glass dosimeter measuring device used for a radiation management system and the like.
In particular, the present invention relates to a fluorescent glass dosimeter measuring device that measures the exposure dose to a fluorescent glass element that has been exposed to radiation with high accuracy.
【０００２】[0002]
【従来の技術】放射線防護上、原子炉、加速器、Ｘ線発
生器、およびラジオアイソトープ等の施設の設置に当た
っては、放射線管理に万全を期す必要があり、また、そ
の施設従事者ないし利用者においては、その放射線被曝
線量を所定の許容範囲内に止める必要がある。そのた
め、施設の複数箇所に設置された各線量計の線量を個別
に測定し、それらの線量データを適切に管理することが
非常に重要となっている。2. Description of the Related Art In radiation protection, when installing facilities such as a nuclear reactor, an accelerator, an X-ray generator, and a radioisotope, it is necessary to ensure thorough radiation management. Must keep its radiation exposure dose within a predetermined allowable range. For this reason, it is very important to individually measure the dose of each dosimeter installed at a plurality of places in the facility and appropriately manage the dose data.
【０００３】従来、この種の被曝線量の測定は、放射線
被曝された蛍光ガラス素子に対し、窒素ガスレーザ装置
等の紫外線励起光源から励起紫外線パルスを照射し、こ
のとき蛍光ガラス素子から発生する蛍光パルスを検出す
ることにより行われている。Conventionally, this type of exposure dose measurement is performed by irradiating a fluorescent glass element to which radiation has been irradiated with an excitation ultraviolet pulse from an ultraviolet excitation light source such as a nitrogen gas laser device. This is done by detecting
【０００４】ところで、窒素ガスレーザ装置等の紫外線
励起光源の出力は、電源変動や経年変化などの要因によ
って変動し、それに伴って励起紫外線パルスの強度も変
動する。このように、励起紫外線パルスの強度が変動す
ると、蛍光ガラス素子から発生する蛍光パルスの強度も
変動するので、これを補償する観点から、従来は、放射
線被曝蛍光ガラス素子に照射する励起紫外線パルスの一
部を標準蛍光ガラス素子に照射して、各蛍光ガラス素子
から発生する蛍光パルスの強度の変動量を求めた後、こ
の変動量に基づいて放射線被曝蛍光ガラス素子から発生
する蛍光パルスの強度を補正し、被曝線量を測定してい
る。[0004] The output of an ultraviolet excitation light source such as a nitrogen gas laser device fluctuates due to factors such as power supply fluctuation and aging, and the intensity of the excitation ultraviolet pulse fluctuates accordingly. As described above, when the intensity of the excitation ultraviolet pulse fluctuates, the intensity of the fluorescence pulse generated from the fluorescent glass element also fluctuates. From the viewpoint of compensating for this, conventionally, the intensity of the excitation ultraviolet pulse applied to the radiation-exposed fluorescent glass element is conventionally increased. After irradiating a part to the standard fluorescent glass element and calculating the variation of the intensity of the fluorescent pulse generated from each fluorescent glass element, the intensity of the fluorescent pulse generated from the fluorescent glass element exposed to radiation is determined based on this variation. After correcting, the exposure dose is measured.
【０００５】また、本発明者は、標準蛍光ガラス素子及
び放射線被曝蛍光ガラス素子の双方に照射する励起紫外
線パルスの面内強度分布を等しくすべく、特開平８−２
２０２３５号に示すような蛍光ガラス線量計測装置を提
案している。すなわち、この蛍光ガラス線量計測装置
は、励起紫外線パルスを所定の形状に整形するためのダ
イアフラムを設け、このダイアフラムを通過した励起紫
外線パルスの一部を分岐して標準蛍光ガラス素子に照射
するとともに、励起紫外線パルスの一部を放射線被曝蛍
光ガラス素子に照射する光学系を設けることにより、両
蛍光ガラス素子に照射する励起紫外線パルスの面内強度
分布を等しくすることを可能にしたものである。The inventor of the present invention disclosed in Japanese Unexamined Patent Publication No. Hei 8 (1996) -82, in order to equalize the in-plane intensity distribution of the excitation ultraviolet pulse applied to both the standard fluorescent glass element and the radiation-exposed fluorescent glass element.
No. 20235 proposes a fluorescent glass dosimeter. That is, this fluorescent glass dosimetry device is provided with a diaphragm for shaping the excitation ultraviolet pulse into a predetermined shape, and irradiates a part of the excitation ultraviolet pulse that has passed through the diaphragm to the standard fluorescent glass element, By providing an optical system for irradiating a part of the excitation ultraviolet pulse to the radiation-exposed fluorescent glass element, it is possible to equalize the in-plane intensity distribution of the excitation ultraviolet pulse applied to both fluorescent glass elements.
【０００６】図４は、かかる蛍光ガラス線量計測定装置
の構成を示す図である。すなわち、励起紫外線パルスを
発生する紫外線励起光源として窒素ガスレーザ装置１が
設けられ、この窒素ガスレーザ装置１の光軸上には、励
起紫外線パルスを所定の形状に整形するためのダイアフ
ラム２が配設されている。FIG. 4 is a diagram showing a configuration of such a fluorescent glass dosimeter measuring device. That is, a nitrogen gas laser device 1 is provided as an ultraviolet excitation light source for generating an excitation ultraviolet pulse, and a diaphragm 2 for shaping the excitation ultraviolet pulse into a predetermined shape is provided on the optical axis of the nitrogen gas laser device 1. ing.
【０００７】また、ダイアフラム２の出射側には、所定
の短い距離或いは接触させた状態で遮光容器３が設けら
れている。この遮光容器３は、ダイアフラム２のスリッ
ト光軸上に、このダイアフラムによって整形された励起
紫外線パルスの幅よりも若干狭幅の入射口と広幅の出射
口を備えている。A light-shielding container 3 is provided on the emission side of the diaphragm 2 at a predetermined short distance or in contact with the light-shielding container. The light-shielding container 3 has, on the slit optical axis of the diaphragm 2, an entrance and an exit that are slightly narrower than the width of the excitation ultraviolet pulse shaped by the diaphragm.
【０００８】さらに、この遮光容器３の内部には、前記
入射口側より出射口側の方向に石英板４、紫外線透過フ
ィルタ７がこの順序で内蔵されている。この石英板４
は、前記励起紫外線パルスの光軸に対して４５゜の角度
で配置され、ダイアフラム２から照射される励起紫外線
パルスの一部を直角方向に反射分光するように構成され
ている。Further, inside the light-shielding container 3, a quartz plate 4 and an ultraviolet transmission filter 7 are built in this order from the entrance side to the exit side. This quartz plate 4
Is arranged at an angle of 45 ° with respect to the optical axis of the excitation ultraviolet pulse, and is configured to reflect and spectrally reflect a part of the excitation ultraviolet pulse emitted from the diaphragm 2 in a right angle direction.
【０００９】また、石英板４によって反射分光された光
軸上には、標準蛍光ガラス素子５が配置され、この標準
蛍光ガラス素子５の紫外線入射面と直交する方向の標準
蛍光パルス発生側には、第１の光電変換素子６が配置さ
れている。これら標準蛍光ガラス素子５及び第１の光電
変換素子６は、遮光容器３の内部に収納されているた
め、標準蛍光ガラス素子５から発生する蛍光パルス等は
外部に漏れることなく第１の光電変換素子６に導入され
る。A standard fluorescent glass element 5 is arranged on the optical axis reflected and reflected by the quartz plate 4, and a standard fluorescent pulse generating side of the standard fluorescent glass element 5 in a direction orthogonal to the ultraviolet incident surface is provided. , A first photoelectric conversion element 6. Since the standard fluorescent glass element 5 and the first photoelectric conversion element 6 are housed inside the light-shielding container 3, the fluorescent pulse or the like generated from the standard fluorescent glass element 5 does not leak out to the first photoelectric conversion element. The element 6 is introduced.
【００１０】一方、遮光容器３の外部には、この遮光容
器３の出射口からの光軸上に、放射線被曝蛍光ガラス素
子８が配置されている。すなわち、前記石英板４、紫外
線透過フィルタ７及び放射線被曝蛍光ガラス素子８が、
前記励起紫外線パルスの光軸上にこの順序で配置されて
いる。そして、この放射線被曝蛍光ガラス素子８の紫外
線入射面と直交する方向の被測定蛍光パルス発生側に
は、第２の光電変換素子９が配置されている。On the other hand, outside the light-shielding container 3, a radiation-exposed fluorescent glass element 8 is arranged on the optical axis from the exit of the light-shielding container 3. That is, the quartz plate 4, the ultraviolet transmission filter 7, and the radiation-exposed fluorescent glass element 8
They are arranged in this order on the optical axis of the excitation ultraviolet pulse. A second photoelectric conversion element 9 is disposed on the side of the fluorescent glass element 8 to be exposed to which the measured fluorescent pulse is generated in a direction orthogonal to the ultraviolet incident surface.
【００１１】このような構成を有する蛍光ガラス線量計
測装置は、以下に述べるように作用する。すなわち、窒
素ガスレーザ１からの励起紫外線パルスは、ダイアフラ
ム２を通過して所定の形状に整形された後、遮光容器３
の内部に導入され、石英板４に入射し、石英板４によっ
て分光される。そして、石英板４によって反射分光され
た励起紫外線パルスは、標準蛍光ガラス素子５に照射さ
れ、この標準蛍光ガラス素子５を励起して標準蛍光パル
スを発生させ、この標準蛍光パルスが第１の光電変換素
子６によって検出される。The fluorescent glass dosimeter having such a configuration operates as described below. That is, the excitation ultraviolet pulse from the nitrogen gas laser 1 passes through the diaphragm 2 and is shaped into a predetermined shape.
, Is incident on the quartz plate 4, and is separated by the quartz plate 4. The excitation ultraviolet pulse reflected and reflected by the quartz plate 4 is applied to the standard fluorescent glass element 5 to excite the standard fluorescent glass element 5 to generate a standard fluorescent pulse. It is detected by the conversion element 6.
【００１２】また、石英板４によって透過分光された励
起紫外線パルスは、遮光容器３内の紫外線透過フィルタ
７を介して、遮光容器３の外部の放射線被曝蛍光ガラス
素子８に照射され、この放射線被曝蛍光ガラス素子８を
励起して、放射線被曝量に相当する被測定蛍光パルスを
発生させ、この被測定蛍光パルスが第２の光電変換素子
６によって検出される。The excitation ultraviolet pulse transmitted through the quartz plate 4 is applied to a radiation-exposed fluorescent glass element 8 outside the light-shielding container 3 via an ultraviolet-ray transmission filter 7 in the light-shielding container 3. The fluorescent glass element 8 is excited to generate a measured fluorescent pulse corresponding to the radiation exposure dose, and the measured fluorescent pulse is detected by the second photoelectric conversion element 6.
【００１３】[0013]
【発明が解決しようとする課題】しかしながら、上述し
たような従来の蛍光ガラス線量計測定装置には、以下に
述べるような問題点があった。However, the conventional fluorescent glass dosimeter measuring apparatus as described above has the following problems.
【００１４】すなわち、従来の蛍光ガラス線量計測定装
置に用いられる石英板４の厚さは、励起紫外線パルスの
上下幅の約１／２（０．５倍）に設定されている。その
ため、図５に示したように、石英板４で反射分光されて
標準蛍光ガラス素子５に照射される励起紫外線パルス
は、石英板４の表面から反射する励起紫外線パルスと、
石英板４の裏面から反射する励起紫外線パルスとが殆ど
重なり合い、また、通常使用される励起紫外線パルスは
単色光であることから、光干渉が発生する。That is, the thickness of the quartz plate 4 used in the conventional fluorescent glass dosimeter measuring device is set to about 1/2 (0.5 times) the vertical width of the excitation ultraviolet pulse. Therefore, as shown in FIG. 5, the excitation ultraviolet pulse reflected and separated by the quartz plate 4 and applied to the standard fluorescent glass element 5 includes an excitation ultraviolet pulse reflected from the surface of the quartz plate 4 and
The excitation ultraviolet pulse reflected from the back surface of the quartz plate 4 almost overlaps, and the excitation ultraviolet pulse generally used is monochromatic light, so that optical interference occurs.
【００１５】この光干渉量が常に一定であれば問題はな
いが、周囲温度の変動や振動等によって石英板４の角度
が微小変化した場合、上記両励起紫外線パルス間の光干
渉量が変化し、標準蛍光ガラス素子５に照射される励起
紫外線パルスの強度が経時変動する。その結果、標準蛍
光ガラス素子５から発生する標準蛍光パルスの強度が励
起紫外線パルスの強度に比例しなくなるため、放射線被
曝蛍光ガラス素子８から発生する被測定蛍光パルスの強
度を正しく補正することができず、放射線被曝蛍光ガラ
ス素子８の被曝線量を正しく測定することができないと
いう問題点があった。There is no problem if the amount of light interference is always constant, but if the angle of the quartz plate 4 is slightly changed due to fluctuations in ambient temperature, vibrations, etc., the amount of light interference between the two excitation ultraviolet pulses changes. The intensity of the excitation ultraviolet pulse applied to the standard fluorescent glass element 5 varies with time. As a result, the intensity of the standard fluorescent pulse generated from the standard fluorescent glass element 5 is not proportional to the intensity of the excitation ultraviolet pulse, so that the intensity of the measured fluorescent pulse generated from the radiation-exposed fluorescent glass element 8 can be correctly corrected. However, there was a problem that the exposure dose of the fluorescent glass element 8 exposed to radiation could not be measured correctly.
【００１６】本発明は、上述したような従来技術の問題
点を解消するために提案されたもので、その目的は、励
起紫外線パルスの分岐手段における表裏反射光間の光干
渉を防止し、放射線被曝蛍光ガラス素子の被曝線量を高
精度に測定することを可能とした蛍光ガラス線量計測定
装置を提供することにある。The present invention has been proposed in order to solve the above-mentioned problems of the prior art. It is an object of the present invention to prevent light interference between reflected light from the front and back of a pumping ultraviolet pulse branching means, An object of the present invention is to provide a fluorescent glass dosimeter measuring device capable of measuring an exposure dose of an exposed fluorescent glass element with high accuracy.
【００１７】[0017]
【課題を解決するための手段】上記の目的を達成するた
めに、請求項１に記載の発明は、励起紫外線パルスを発
生する紫外線励起光源と、この励起紫外線パルスを受け
てそれぞれ蛍光パルスを発生する標準蛍光ガラス素子お
よび放射線被曝蛍光ガラス素子と、前記励起紫外線パル
スの一部を分岐して前記標準蛍光ガラス素子に照射する
とともに、前記励起紫外線パルスの一部を前記放射線被
曝蛍光ガラス素子に照射する分岐手段を備えた蛍光ガラ
ス線量計測定装置において、前記分岐手段の表面から反
射分光される励起紫外線パルスの一部と、裏面から反射
分光される励起紫外線パルスの一部とが、互いに重なり
合わないように構成されていることを特徴とするもので
ある。In order to achieve the above object, the invention according to claim 1 provides an ultraviolet excitation light source for generating an excitation ultraviolet pulse, and generates a fluorescent pulse upon receiving the excitation ultraviolet pulse. A standard fluorescent glass element and a radiation-exposed fluorescent glass element, and a part of the excitation ultraviolet pulse is branched and irradiated on the standard fluorescent glass element, and a part of the excitation ultraviolet pulse is irradiated on the radiation-exposed fluorescent glass element. In a fluorescent glass dosimeter measuring device provided with a branching means, a part of the excitation ultraviolet pulse reflected and reflected from the front surface of the branching means and a part of the excitation ultraviolet pulse reflected and reflected from the back surface overlap each other. It is characterized in that it is not configured.
【００１８】このような構成を有する請求項１記載の発
明によれば、分岐手段の表面から反射する励起紫外線パ
ルスと、裏面から反射する励起紫外線パルスとが重なり
合わないため、両励起紫外線パルス間で光干渉が発生せ
ず、標準蛍光ガラス素子に照射される励起紫外線パルス
の強度が光干渉により経時変化することがなくなる。According to the first aspect of the present invention, since the excitation ultraviolet pulse reflected from the front surface of the branching means and the excitation ultraviolet pulse reflected from the back surface do not overlap with each other, the interval between the excitation ultraviolet pulses is not changed. No optical interference occurs, and the intensity of the excitation ultraviolet pulse applied to the standard fluorescent glass element does not change with time due to the optical interference.
【００１９】その結果、標準蛍光ガラス素子から発生す
る標準蛍光パルスの強度は、常に励起紫外線パルスの強
度に比例することになるため、標準蛍光ガラス素子から
発生する標準蛍光パルスの強度に基づいて、放射線被曝
蛍光ガラス素子から発生する被測定蛍光パルスの強度を
正しく補正することができるので、放射線被曝蛍光ガラ
ス素子の被曝線量を正しく測定することができる。As a result, the intensity of the standard fluorescent pulse generated from the standard fluorescent glass element is always proportional to the intensity of the excitation ultraviolet light pulse. Since the intensity of the fluorescent pulse to be measured generated from the fluorescent glass element exposed to radiation can be correctly corrected, the exposure dose of the fluorescent glass element exposed to radiation can be correctly measured.
【００２０】また、請求項２に記載の発明は、請求項１
記載の蛍光ガラス線量計測定装置において、前記分岐手
段の厚さが、分岐手段に入射される励起紫外線パルスの
上下幅の約１．３倍以上に設定されていることを特徴と
するものである。The invention described in claim 2 is the same as the invention described in claim 1.
In the fluorescent glass dosimeter measuring device described above, the thickness of the branching means is set to be about 1.3 times or more the vertical width of the excitation ultraviolet pulse incident on the branching means. .
【００２１】このような構成を有する請求項２に記載の
発明によれば、分岐手段の表面から反射分光される励起
紫外線パルスの一部と、裏面から反射分光される励起紫
外線パルスの一部とが、互いに重なり合わないように構
成することができる。According to the second aspect of the present invention having such a configuration, a part of the excitation ultraviolet pulse reflected and reflected from the front surface of the branching unit and a part of the excitation ultraviolet pulse reflected and reflected from the back surface are provided. Can be configured so that they do not overlap with each other.
【００２２】請求項３に記載の発明は、請求項１又は請
求項２に記載の蛍光ガラス線量計測定装置において、前
記分岐手段が、前記励起紫外線パルスの光軸に対して４
５゜の角度で配置されていることを特徴とするものであ
る。According to a third aspect of the present invention, in the fluorescent glass dosimeter measuring apparatus according to the first or second aspect, the branching means is provided with an optical axis of the excitation ultraviolet pulse having a distance of 4 degrees.
It is characterized by being arranged at an angle of 5 °.
【００２３】このような構成を有する請求項３に記載の
発明によれば、分岐手段により反射分光される励起紫外
線パルスの一部は、分岐手段への入射光軸に対して直角
に反射されるので、標準蛍光ガラス素子を正確に設置す
ることができ、また、蛍光ガラス線量計測定装置をコン
パクトに構成することができる。According to the third aspect of the present invention having such a configuration, a part of the excitation ultraviolet pulse reflected and split by the branching unit is reflected at right angles to the optical axis incident on the branching unit. Therefore, the standard fluorescent glass element can be accurately set, and the fluorescent glass dosimeter measuring device can be made compact.
【００２４】請求項４に記載の発明は、請求項１乃至請
求項３のいずれか一に記載の蛍光ガラス線量計測定装置
において、前記分岐手段が、石英板より構成されている
ことを特徴とするものである。According to a fourth aspect of the present invention, in the fluorescent glass dosimeter measuring apparatus according to any one of the first to third aspects, the branching means is formed of a quartz plate. Is what you do.
【００２５】このような構成を有する請求項４に記載の
発明によれば、分岐手段として、屈折率が約１．５であ
る石英板を用いることにより、請求項１乃至請求項３の
発明を容易に実施することができる。According to the fourth aspect of the present invention having the above-described structure, a quartz plate having a refractive index of about 1.5 is used as the branching means. It can be easily implemented.
【００２６】[0026]
【発明の実施の形態】以下、本発明の一実施形態につい
て図面を参照して具体的に説明する。なお、図４に示し
た従来形と同一の部材には同一の符号を付して、説明は
省略する。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings. The same members as those of the conventional type shown in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.
【００２７】本実施形態においては、図１に示したよう
に、励起紫外線パルスの一部を直角方向に反射分光させ
る分岐手段である石英板１０は、励起紫外線パルスの光
軸に対して４５゜の角度で配置され、また、その厚み
が、励起紫外線パルスの上下幅の約１．５倍以上に設定
されている。In the present embodiment, as shown in FIG. 1, the quartz plate 10, which is a branching means for reflecting and separating a part of the excitation ultraviolet pulse in the right angle direction, is 45 ° with respect to the optical axis of the excitation ultraviolet pulse. And the thickness thereof is set to about 1.5 times or more the vertical width of the excitation ultraviolet pulse.
【００２８】ここで、石英板１０の厚みを励起紫外線パ
ルスの上下幅の約１．５倍以上に設定した理由について
説明する。Here, the reason why the thickness of the quartz plate 10 is set to be about 1.5 times or more the vertical width of the excitation ultraviolet pulse will be described.
【００２９】すなわち、図２に示したように、励起紫外
線パルスの上下幅をａ、石英板１０の厚みをｂ、石英板
の屈折率を１．５とした場合に、励起紫外線パルスの下
側の入射光１１ａの内、石英板１０の裏側で反射した光
１１ｂが、励起紫外線パルスの上側の入射光１２ａの
内、石英板１０の表面で反射した光１２ｂと重なり合わ
ないようにするには、石英板１０の厚みｂを、以下のよ
うに設定する必要がある。That is, as shown in FIG. 2, when the vertical width of the excitation ultraviolet pulse is a, the thickness of the quartz plate 10 is b, and the refractive index of the quartz plate is 1.5, the lower side of the excitation ultraviolet pulse is Of the incident light 11a reflected on the back side of the quartz plate 10 does not overlap with the light 12b reflected on the surface of the quartz plate 10 out of the incident light 12a on the upper side of the excitation ultraviolet pulse. It is necessary to set the thickness b of the quartz plate 10 as follows.
【００３０】[0030]
【数１】 このように、石英板１０の厚みは、励起紫外線パルスの
上下幅に対して、約１．３倍以上、より好ましくは約
１．５倍以上に設定することが望ましい。一方、石英板
１０の厚みが厚すぎると、石英板１０の表面で反射した
励起紫外線パルスと裏側で反射した励起紫外線パルスと
が離れすぎるため、これらが照射される標準蛍光ガラス
素子５を大きくする必要が生じ、ひいては、蛍光ガラス
線量計測定装置全体の大型化を余儀なくされることにな
る。このため、石英板１０の厚みは、励起紫外線パルス
の上下幅に対して、約３倍以下とすることが望ましい。(Equation 1) As described above, the thickness of the quartz plate 10 is desirably set to about 1.3 times or more, more preferably about 1.5 times or more, with respect to the vertical width of the excitation ultraviolet pulse. On the other hand, if the thickness of the quartz plate 10 is too thick, the excitation ultraviolet pulse reflected on the surface of the quartz plate 10 and the excitation ultraviolet pulse reflected on the back side are too far apart, so that the standard fluorescent glass element 5 to which these are irradiated is enlarged. The necessity arises, and as a result, the size of the entire fluorescent glass dosimeter measuring device must be increased. For this reason, it is desirable that the thickness of the quartz plate 10 be about three times or less the vertical width of the excitation ultraviolet pulse.
【００３１】このような構成を有する本実施形態の蛍光
ガラス線量計測定装置は、以下に述べるように作用す
る。The fluorescent glass dosimeter measuring apparatus of this embodiment having such a configuration operates as described below.
【００３２】すなわち、窒素ガスレーザ１より発生され
た励起紫外線パルスは、ダイアフラム２で所定の形状に
整形されて遮光容器３に入り、石英板１０に入射され
る。この場合、本実施形態においては、図３に示したよ
うに、励起紫外線パルスの一部が石英板１０の表面と裏
面からそれぞれ反射され、互いに重なり合わずに標準蛍
光ガラス素子５に入射され、これを励起して標準蛍光パ
ルスを発生させる。このとき、標準蛍光ガラス素子５は
遮光容器３および紫外線透過フィルタ７により覆われて
いるので、標準蛍光ガラス素子５が発生する標準蛍光パ
ルスは、遮光容器３の外部にある第２の光電変換素子９
には検出されず、正確な測定が可能となる。That is, the excitation ultraviolet pulse generated by the nitrogen gas laser 1 is shaped into a predetermined shape by the diaphragm 2, enters the light shielding container 3, and is incident on the quartz plate 10. In this case, in the present embodiment, as shown in FIG. 3, a part of the excitation ultraviolet pulse is reflected from the front and back surfaces of the quartz plate 10, respectively, and is incident on the standard fluorescent glass element 5 without overlapping each other. This is excited to generate a standard fluorescence pulse. At this time, since the standard fluorescent glass element 5 is covered by the light-shielding container 3 and the ultraviolet transmission filter 7, the standard fluorescent pulse generated by the standard fluorescent glass element 5 is transmitted to the second photoelectric conversion element outside the light-shielding container 3. 9
And accurate measurement is possible.
【００３３】一方、石英板１０を透過した励起紫外線パ
ルスは、紫外線透過フィルタ７を介して遮光容器３の外
に出る。また、遮光容器３の外に出た励起紫外線パルス
は放射線被曝蛍光ガラス素子８に入射され、ここで放射
線被曝量に相当する被測定蛍光パルスを発生し、この被
測定蛍光パルスが第２の光電変換素子９によって検出さ
れる。On the other hand, the excitation ultraviolet pulse transmitted through the quartz plate 10 goes out of the light shielding container 3 via the ultraviolet transmission filter 7. Further, the excitation ultraviolet pulse that has exited the light-shielding container 3 is incident on the fluorescent glass element 8 exposed to radiation, and generates a fluorescent pulse to be measured corresponding to the amount of radiation exposure. It is detected by the conversion element 9.
【００３４】このように、本実施形態によれば、前記励
起紫外線パルスの一部を分岐するために設けられた石英
板１０において、その表面から反射した励起紫外線パル
スと、裏面から反射した励起紫外線パルスとが重なり合
わないため、両励起紫外線パルス間で光干渉が発生せ
ず、標準蛍光ガラス素子５に照射される励起紫外線パル
スの強度が光干渉により経時変化することがなくなる。
これにより、標準蛍光ガラス素子５から発生する標準蛍
光パルスの強度は、常に励起紫外線パルスの強度に比例
することになる。As described above, according to the present embodiment, in the quartz plate 10 provided for branching a part of the excitation ultraviolet pulse, the excitation ultraviolet pulse reflected from the front surface and the excitation ultraviolet light reflected from the back surface are used. Since the pulses do not overlap, optical interference does not occur between both excitation ultraviolet pulses, and the intensity of the excitation ultraviolet pulse applied to the standard fluorescent glass element 5 does not change with time due to the optical interference.
Thus, the intensity of the standard fluorescent pulse generated from the standard fluorescent glass element 5 is always proportional to the intensity of the excitation ultraviolet pulse.
【００３５】また、励起紫外線パルスは、ダイアフラム
２で所定の形状に整形された後、分光されて標準蛍光ガ
ラス素子５と放射線被曝蛍光ガラス素子８の双方に入射
される。このため、両蛍光ガラス素子５、８が受ける励
起紫外線パルスは、両蛍光ガラス素子間で常に強度変動
と面内強度分布とがそれぞれ等しく、かつ強度が比例す
ることになる。The excitation ultraviolet pulse is shaped into a predetermined shape by the diaphragm 2, then split and incident on both the standard fluorescent glass element 5 and the radiation-exposed fluorescent glass element 8. Therefore, the intensity of the excitation ultraviolet pulse received by both fluorescent glass elements 5 and 8 is always equal between the fluorescent glass elements and the in-plane intensity distribution, and the intensity is proportional.
【００３６】したがって、標準蛍光ガラス素子５から発
生する標準蛍光パルスの強度に基づいて、放射線被曝蛍
光ガラス素子から発生する被測定蛍光パルスの強度を正
しく補正することができるので、放射線被曝蛍光ガラス
素子の被曝線量を正しく測定することができる。Therefore, the intensity of the measured fluorescent pulse generated from the radiation-exposed fluorescent glass element can be correctly corrected based on the intensity of the standard fluorescent pulse generated from the standard fluorescent glass element 5, so that the radiation-exposed fluorescent glass element can be corrected. Can be measured correctly.
【００３７】[0037]
【他の実施例】なお、本発明は、上述した実施形態に限
定されるものでなく、励起紫外線パルスの一部を直角方
向に反射分光する分岐手段において、その表面から反射
分光される励起紫外線パルスの一部と、裏面から反射分
光される励起紫外線パルスの一部とが、互いに重なり合
わないように構成すれば、分岐手段の材質、屈折率等は
適宜変形することができる。[Other Embodiments] The present invention is not limited to the above-described embodiment. In the branching means for reflecting and spectroscopically reflecting a part of the excitation ultraviolet light pulse in the perpendicular direction, the excitation ultraviolet light reflected and spectrally reflected from the surface thereof is provided. If a part of the pulse and a part of the excitation ultraviolet pulse reflected and reflected from the back surface are configured not to overlap each other, the material, the refractive index, and the like of the branching unit can be appropriately changed.
【００３８】また、前記石英板の代わりに、２個の直角
プリズムを接着して立方体にしたプリズム型ビームスプ
リッターを用いても同様に実施できる。Further, the present invention can be similarly carried out by using a prism type beam splitter in which two right-angle prisms are bonded to form a cube instead of the quartz plate.
【００３９】[0039]
【発明の効果】以上のように、本発明によれば、肉厚の
厚い分岐手段を使用することで、分岐手段における表裏
反射光間の光干渉を防止し、放射線被曝蛍光ガラス素子
の被曝線量を高精度に測定することを可能とした蛍光ガ
ラス線量計測定装置を提供することができる。As described above, according to the present invention, by using the thick branching means, light interference between the front and back reflected light at the branching means can be prevented, and the radiation exposure dose of the fluorescent glass element exposed to radiation can be prevented. Can be provided with a fluorescent glass dosimeter measuring device capable of measuring the measurement with high accuracy.
【図１】本発明の蛍光ガラス線量計測定装置の一実施形
態の構成を示す図FIG. 1 is a diagram showing a configuration of an embodiment of a fluorescent glass dosimeter measuring device of the present invention.
【図２】本発明の蛍光ガラス線量計測定装置の石英板の
厚さを求めるための図FIG. 2 is a diagram for determining the thickness of a quartz plate of the fluorescent glass dosimeter measuring device of the present invention.
【図３】本発明の蛍光ガラス線量計測定装置の石英板近
傍の詳細を示す図FIG. 3 is a diagram showing details of a vicinity of a quartz plate of the fluorescent glass dosimeter measuring device of the present invention.
【図４】従来の蛍光ガラス線量計測定装置の構成を示す
図FIG. 4 is a diagram showing a configuration of a conventional fluorescent glass dosimeter measuring device.
【図５】従来の蛍光ガラス線量計測定装置の石英板近傍
の詳細を示す図FIG. 5 is a diagram showing details of the vicinity of a quartz plate of a conventional fluorescent glass dosimeter measuring device.
１…窒素ガスレーザ ２…ダイアフラム ３…遮光容器 ４…石英板 ５…標準蛍光ガラス素子 ６…第１の光電変換素子 ７…紫外線透過フィルタ ８…放射線被曝蛍光ガラス素子 ９…第２の光電変換素子 １０…石英板 DESCRIPTION OF SYMBOLS 1 ... Nitrogen gas laser 2 ... Diaphragm 3 ... Light shielding container 4 ... Quartz plate 5 ... Standard fluorescent glass element 6 ... First photoelectric conversion element 7 ... Ultraviolet transmission filter 8 ... Radiation exposed fluorescent glass element 9 ... Second photoelectric conversion element 10 … Quartz plate
Claims (4)
光源と、 この励起紫外線パルスを受けてそれぞれ蛍光パルスを発
生する標準蛍光ガラス素子および放射線被曝蛍光ガラス
素子と、 前記励起紫外線パルスの一部を分岐して前記標準蛍光ガ
ラス素子に照射するとともに、前記励起紫外線パルスの
一部を前記放射線被曝蛍光ガラス素子に照射する分岐手
段を備えた蛍光ガラス線量計測定装置において、 前記分岐手段の表面から反射分光される励起紫外線パル
スの一部と、裏面から反射分光される励起紫外線パルス
の一部とが、互いに重なり合わないように構成されてい
ることを特徴とする蛍光ガラス線量計測定装置。1. An ultraviolet excitation light source for generating an excitation ultraviolet pulse, a standard fluorescent glass element and a radiation-exposed fluorescent glass element for respectively generating a fluorescent pulse in response to the excitation ultraviolet pulse, and branching a part of the excitation ultraviolet pulse. A fluorescent glass dosimeter measuring device provided with branching means for irradiating the standard fluorescent glass element and irradiating a part of the excitation ultraviolet pulse to the radiation-exposed fluorescent glass element, wherein reflection spectroscopy is performed from the surface of the branching means. A part of the excitation ultraviolet pulse to be emitted and a part of the excitation ultraviolet pulse reflected and reflected from the back surface are configured not to overlap each other.
される励起紫外線パルスの上下幅の約１．３倍以上に設
定されていることを特徴とする請求項１記載の蛍光ガラ
ス線量計測定装置。2. The fluorescent glass dose according to claim 1, wherein the thickness of the branching means is set to be about 1.3 times or more the vertical width of the excitation ultraviolet pulse incident on the branching means. Meter measuring device.
の光軸に対して４５゜の角度で配置されていることを特
徴とする請求項１又は請求項２に記載の蛍光ガラス線量
計測定装置。3. The fluorescent glass dosimeter measuring apparatus according to claim 1, wherein the branching means is arranged at an angle of 45 ° with respect to the optical axis of the excitation ultraviolet pulse. .
いることを特徴とする請求項１乃至請求項３のいずれか
一に記載の蛍光ガラス線量計測定装置。4. The fluorescent glass dosimeter measuring apparatus according to claim 1, wherein said branching means is constituted by a quartz plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23776597A JP3169346B2 (en) | 1997-08-19 | 1997-08-19 | Fluorescent glass dosimeter measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23776597A JP3169346B2 (en) | 1997-08-19 | 1997-08-19 | Fluorescent glass dosimeter measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1164525A true JPH1164525A (en) | 1999-03-05 |
| JP3169346B2 JP3169346B2 (en) | 2001-05-21 |
Family
ID=17020122
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23776597A Expired - Fee Related JP3169346B2 (en) | 1997-08-19 | 1997-08-19 | Fluorescent glass dosimeter measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3169346B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6082067B2 (en) * | 2015-01-06 | 2017-02-15 | タボット株式会社 | Sheets, cases, and programs used for mobile terminals |
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1997
- 1997-08-19 JP JP23776597A patent/JP3169346B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP3169346B2 (en) | 2001-05-21 |
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