CN215867140U - Hemispherical measuring cavity of radon measuring instrument by adopting static collection method of CR-39 solid nuclear track detector - Google Patents
Hemispherical measuring cavity of radon measuring instrument by adopting static collection method of CR-39 solid nuclear track detector Download PDFInfo
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- CN215867140U CN215867140U CN202122139002.7U CN202122139002U CN215867140U CN 215867140 U CN215867140 U CN 215867140U CN 202122139002 U CN202122139002 U CN 202122139002U CN 215867140 U CN215867140 U CN 215867140U
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Abstract
The hemispherical measuring cavity of the radon measuring instrument adopting the static collection method of the CR-39 solid nuclear track detector comprises a base, the hemispherical measuring cavity, the CR-39 solid nuclear track detector, a high-voltage contact, a high-voltage module and a rubber sealing gasket. The upper surface of the base is attached with a layer of aluminum foil, the upper surface of the base is provided with a square hole, the bottom of the square hole is coated with a layer of conductive silver adhesive, and the CR-39 solid nuclear track detector is placed on the conductive silver adhesive at the bottom of the square hole. Conductive silver adhesive is attached to the inner wall of the cavity of the hemispherical measuring cavity, two air pipe valves are symmetrically arranged on the wall of the cavity of the hemispherical measuring cavity, and the high-voltage contact is arranged at the top of the hemispherical measuring cavity. The base is connected with the hemispherical measuring cavity through a bolt, the rubber sealing washer is arranged on the interface end face of the base and the hemispherical measuring cavity, the high-voltage contact is connected with the positive electrode of the high-voltage module, and the conductive silver adhesive at the bottom of the square hole is connected with the negative electrode of the high-voltage module. The measuring cavity is simple in structure and easy to manufacture, an electric field in the cavity can be optimized during measurement, and the collection efficiency and the measurement sensitivity are improved.
Description
Technical Field
The utility model relates to an environmental radon concentration measuring device, in particular to a hemispherical measuring cavity of a radon measuring instrument by adopting an electrostatic collection method of a CR-39 solid nuclear track detector.
Background
High radon concentration in the environment (Rn-222) can affect people's health. The principle of synchronous measurement of radon concentration by adopting electrostatic collection and solid nuclear track in environmental radon measurement is that after radon-containing air enters a measurement cavity, Po-218 with positive charge generated by new decay of radon is collected on the surface of a CR-39 solid nuclear track detector under the action of an electrostatic field, alpha particles generated by decay of Po-218 enter a CR-39 solid material to form a latent track along the range track, and the latent track in the detector material is amplified through chemical etching to reach the micron-grade degree observable by a common optical microscope. And (4) substituting the number of the latent tracks into a formula to reversely deduce the radon concentration.
The electric field in the existing hemispherical measurement cavity has a large impact on the collection efficiency of the positively charged Po-218. For this reason, it is a challenging task to optimize the materials and structures in the cavity so that the electric field can achieve the optimal effect of collecting Po-218.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a hemispherical measuring cavity of a radon measuring instrument adopting an electrostatic collection method of a CR-39 solid nuclear track detector.
The technical scheme of the utility model is as follows: the hemispherical measuring cavity of the radon measuring instrument adopting the static collection method of the CR-39 solid nuclear track detector comprises a base, the hemispherical measuring cavity, the CR-39 solid nuclear track detector, a high-voltage contact, a high-voltage module and a rubber sealing gasket.
The base is disc-shaped, a layer of aluminum foil is attached to the upper surface of the base, a square hole for installing the CR-39 solid nuclear track detector is formed in the upper surface of the base, a layer of conductive silver adhesive is coated at the bottom of the square hole, and the CR-39 solid nuclear track detector is placed on the conductive silver adhesive at the bottom of the square hole.
The inner wall of the cavity of the hemispherical measurement cavity is adhered with a layer of conductive silver colloid, the wall of the hemispherical measurement cavity is symmetrically provided with a first air pipe valve and a second air pipe valve, a pipeline of the first air pipe valve is further provided with a filter, and a high-voltage contact is arranged at the top of the hemispherical measurement cavity and is connected with the conductive silver colloid in the cavity.
The base passes through bolted connection with the hemisphere measurement chamber, and rubber seal ring installs the interface terminal surface in base and hemisphere measurement chamber, and high-pressure contact passes through the wire to be connected with the positive pole of high-pressure module, and the electrically conductive silver adhesive of quad slit bottom passes through the wire to be connected with the negative pole of high-pressure module, and the aluminium foil of base upper surface and the electrically conductive silver adhesive contactless in the hemisphere measurement chamber cavity.
The further technical scheme of the utility model is as follows: the base and the hemispherical measuring cavity are both made of plastic materials.
Compared with the prior art, the utility model has the following characteristics:
the cavity of the hemispherical measuring cavity of the radon measuring instrument adopting the CR-39 solid nuclear track detector has a simple structure, is easy to manufacture, can optimize an electric field in the cavity during measurement, improves the collecting efficiency and the measuring sensitivity of the Po-218 with positive electricity, and can shield the influence of the electric field outside the cavity.
The detailed structure of the present invention will be further described with reference to the accompanying drawings and the detailed description.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The hemispherical measuring cavity of the radon measuring instrument adopting the static collection method of the CR-39 solid nuclear track detector comprises a base 1, a hemispherical measuring cavity 2, a CR-39 solid nuclear track detector 3, a high-voltage contact 4, a high-voltage module 5 and a rubber sealing gasket 6.
The base 1 is disc-shaped and made of plastic materials, a layer of aluminum foil 1-2 is attached to the upper surface of the base 1, a square hole 1-1 for installing the CR-39 solid nuclear track detector 3 is formed in the upper surface of the base 1, a layer of conductive silver adhesive 1-3 is coated on the bottom of the square hole 1-1, and the CR-39 solid nuclear track detector 3 is placed on the conductive silver adhesive 1-3 at the bottom of the square hole 1-1.
The hemispherical measuring cavity 2 is made of plastic materials, a layer of conductive silver adhesive 2-1 is attached to the inner wall of the cavity, a first air pipe valve 2-2 and a second air pipe valve 2-3 are symmetrically arranged on the wall of the hemispherical measuring cavity 2, a filter 2-4 is further arranged on a pipeline of the first air pipe valve 2-2, and a high-voltage contact 4 is arranged at the top of the hemispherical measuring cavity 2 and is connected with the conductive silver adhesive 2-1 in the cavity.
The base 1 is connected with the hemispherical measuring cavity 2 through a bolt, the rubber sealing washer 6 is installed on the interface end face of the base 1 and the hemispherical measuring cavity 2, the high-voltage contact 4 is connected with the positive electrode of the high-voltage module 5 through a wire, the conductive silver adhesive 1-3 at the bottom of the square hole 1-1 is connected with the negative electrode of the high-voltage module 5 through a wire, and the aluminum foil 1-2 on the upper surface of the base 1 is not in contact with the conductive silver adhesive 2-1 in the hemispherical measuring cavity 2, so that the aluminum foil 1-2 on the upper surface of the base 1 is uncharged and only plays a role in shielding an external electric field.
During measurement, after air containing radon enters a measurement cavity, Po-218 with positive charge generated by the new decay of radon is collected on the surface of a CR-39 solid nuclear track detector 3 under the action of an electrostatic field, and alpha particles generated by the decay of the Po-218 form a latent track along the range track of the CR-39 solid material when entering the CR-39 solid material. After the measurement is finished, the CR-39 solid nuclear track detector 3 is taken out, and the latent track in the detector material is amplified through chemical etching to reach the micron-scale level observable by a common optical microscope. And substituting the number of the latent tracks into a formula to reversely deduce the radon concentration.
Claims (2)
1. Adopt the static collection method emanometer hemisphere measuring cavity of CR-39 solid nuclear track detector, its characteristic is: the device comprises a base, a hemispherical measuring cavity, a CR-39 solid nuclear track detector, a high-pressure contact, a high-pressure module and a rubber sealing gasket;
the base is disc-shaped, a layer of aluminum foil is attached to the upper surface of the base, a square hole for installing the CR-39 solid nuclear track detector is formed in the upper surface of the base, a layer of conductive silver adhesive is coated at the bottom of the square hole, and the CR-39 solid nuclear track detector is placed on the conductive silver adhesive at the bottom of the square hole;
a layer of conductive silver adhesive is attached to the inner wall of the cavity of the hemispherical measuring cavity, a first air pipe valve and a second air pipe valve are symmetrically arranged on the wall of the hemispherical measuring cavity, a filter is further arranged on a pipeline of the first air pipe valve, and a high-voltage contact is arranged at the top of the hemispherical measuring cavity and connected with the conductive silver adhesive in the cavity;
the base passes through bolted connection with the hemisphere measurement chamber, and rubber seal ring installs the interface terminal surface in base and hemisphere measurement chamber, and high-pressure contact passes through the wire to be connected with the positive pole of high-pressure module, and the electrically conductive silver adhesive of quad slit bottom passes through the wire to be connected with the negative pole of high-pressure module, and the aluminium foil of base upper surface and the electrically conductive silver adhesive contactless in the hemisphere measurement chamber cavity.
2. The hemispherical measurement cavity of radon measuring instrument for electrostatic collection using CR-39 solid nuclear track detector as claimed in claim 1, wherein: the base and the hemispherical measuring cavity are both made of plastic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122139002.7U CN215867140U (en) | 2021-09-06 | 2021-09-06 | Hemispherical measuring cavity of radon measuring instrument by adopting static collection method of CR-39 solid nuclear track detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122139002.7U CN215867140U (en) | 2021-09-06 | 2021-09-06 | Hemispherical measuring cavity of radon measuring instrument by adopting static collection method of CR-39 solid nuclear track detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215867140U true CN215867140U (en) | 2022-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122139002.7U Active CN215867140U (en) | 2021-09-06 | 2021-09-06 | Hemispherical measuring cavity of radon measuring instrument by adopting static collection method of CR-39 solid nuclear track detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215867140U (en) |
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2021
- 2021-09-06 CN CN202122139002.7U patent/CN215867140U/en active Active
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