JP7036479B1 - 中性子線被照射装置 - Google Patents
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Abstract
Description
放射線の内の重イオン線は、局所的に電離作用を起こす高LET線であり、エックス線やガンマ線と比べて突然変異の幅(スペクトル)が広いうえに、突然変異体に付随する変異が少なく、低線量で照射効果が高い。しかしながら、物質透過性が物質表面から数10μm(マイクロメートル)と非常に短距離であり、多くの種子への照射ができず、所望量の変位体を得るためには依然長い時間を要する。
各板状部材50の外周部近傍には、板状部材50の周方向にほぼ等間隔に複数の穴が形成されており、この穴に1対の板状部材50、50間の距離を保持するステー124が嵌合している。
上記によって、密閉容器内に収容された被照射体に、順次、中性子線、及び、2次粒子線が照射され、次々と突然変異が誘発されていく。
ビームパワー能力1MWを有する中性子照射線装置からビームパワーを変化させて中性子を照射した場合における、被照射中性子強度の変化を図5に示す。
ステップS930において、被照射位置にある筒状部材40に所定強度の中性子線Nを照射する。照射する中性子線は、冷中性子(E<0.026eV)、熱中性子(0.001 <E<0.01eV)、熱外中性子(0.1<E <100eV)、低速中性子(0.1<E <1000eV)、中速中性子(1<E <500keV)あるいは高速中性子(0.5<E<20MeV)のいずれか、或いはそれらが混在した中性子である。中性子線の線量は、中性子線のエネルギーと被照射体の照射時間で制御され、0.01~110Gyの範囲に設定される。
ステップS940において、照射時間が経過したか否かを図示しない制御装置が判定する。照射時間は「照射パターン」として、被照射物の種類や量に応じて予め設定されており、たとえば5min、10min、1Hr、2Hr等に設定されている。所定時間が経過していなければ照射を継続し、所定時間を経過しておれば、ステップS950に進む。
すなわち、予め定めた照射パターン(典型的には照射時間)に応じて、ある被照射体に対して中性子線が照射された後、回転駆動手段が駆動し、別の被照射体が被照射位置に移動し、再度、所定の照射パターンに応じて、中性子線の照射を受ける。その間、回転駆動手段は、間欠的に駆動する。
Claims (5)
- 中性子線照射装置で発生した中性子線を、被照射体に照射するための中性子線被照射装置であって、
中心軸を有し、被照射体を収容する密閉容器を、前記中心軸を中心とした円周上の少なくとも2つ以上の異なる位置に保持可能な保持手段と、
前記中心軸を回転駆動する回転駆動手段と、
前記回転駆動手段を制御する制御手段と、を備え、
前記位置は、少なくとも前記中性子線の被照射位置を含み、
前記制御手段は、予め定めた照射パターンに応じて前記回転駆動手段を間欠的に駆動して、前記被照射位置に保持される前記密閉容器を変更する、中性子線被照射装置。 - 前記保持手段は、少なくとも軸方向1端部が開放された複数の筒状部材と、この複数の筒状部材の軸方向両端側を固定支持する一対の板状部材を有する、請求項1に記載の中性子線被照射装置。
- 前記筒状部材、前記板状部材、及び、前記中心軸からなる群から選択される少なくとも1種は、アルミニウム、アルミニウム合金、バナジウム合金、フェライト鋼、炭化ケイ素複合材料、酸化物分散強化フェライト鋼、及び、ホウ素材からなる群から選択される少なくとも1種の材質からなる、請求項2に記載の中性子線被照射装置。
- 中性子線照射装置で発生した中性子線を、被照射体に照射するための中性子線被照射装置であって、
中心軸を有し、被照射体を収容する密閉容器を、前記中心軸を中心とした円周上の少なくとも2つ以上の異なる位置に保持可能な保持手段と、
前記中心軸を回転駆動する回転駆動手段と、
前記回転駆動手段を制御する制御手段と、を備え、
前記保持手段は、少なくとも軸方向1端部が開放された複数の筒状部材と、この複数の筒状部材の軸方向両端側を固定支持する一対の板状部材を有し、
前記筒状部材、前記板状部材、及び、前記中心軸からなる群から選択される少なくとも1種は、アルミニウム合金からなり、前記アルミニウム合金は、マンガン55(Mn55)を含む、中性子線被照射装置。 - 更に遮蔽部材を有し、
前記回転駆動手段が前記遮蔽部材により覆われている、請求項1~4のいずれか1項に記載の中性子線被照射装置。
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PCT/JP2022/024585 WO2023007986A1 (ja) | 2021-07-29 | 2022-06-20 | 中性子線被照射装置、突然変異誘発方法、及び、被照射体の製造方法 |
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CN115633634A (zh) * | 2022-06-28 | 2023-01-24 | 江苏天星航天育种科技有限公司 | 一种基于artp的分类式水稻诱变育种装置及方法 |
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