PROBLEM TO BE SOLVED: To provide a radiation detection device capable of reliably shielding radiation coming in from directions other than a direction under measurement with a minimal increase in weight.SOLUTION: A radiation detection device 1 includes: a radiation detector 21 for detecting radiation coming in through a pinhole collimator 11; and a shield body 10 which is provided to surround the radiation detector 21 to prevent radiation coming in from directions outside a field of view of the pinhole collimator 11 from entering the radiation detector 21. Here, a thickness of each part of the shield body 10 is set according to energy of radiation that can possibly transmit therethrough and reach the radiation detector 21. More specifically, the thickness of (each part of) the shield body 10 is set according to radiation (skyshine radiation) generated by scattering by air, of radiation emitted from the ground.
【課題】重量の増大を抑えつつ、測定しようとする方向以外の方向から飛来する放射線を確実に遮蔽することが可能な放射線検出装置を提供する。【解決手段】ピンホールコリメータ11を介して入射する放射線を検出する放射線検出器21と、放射線検出器21の周囲に設けられ、ピンホールコリメータ11の視野外の方向から飛来する放射線の放射線検出器21への入射を防ぐための遮蔽体10とを備えた放射線検出装置1において、遮蔽体10の各部の厚みを、夫々を通って放射線検出器21に到達する可能性のある放射線のエネルギーに応じた厚みに設定する。より具体的には、遮蔽体10の厚みは、地表から放射された放射線が空気と散乱することにより生じた放射線(スカイシャインによる放射線)のエネルギーに応じた厚みに設定する。【選択図】図5
RADIATION DETECTION DEVICE
放射線検出装置
2015-09-07
Patent
Electronic Resource
Japanese
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