CAJ | 학술논문

针对大部分周围剂量当量监测仪和个人剂量当量监测仪不能给出γ射线入射方向的情况，设计了一种简易的、新型的可携式放射源定向测量仪探头。定向测量仪探头由ф76．2 mm ×76．2 mm NaI（Tl）晶体和一个特殊形状的铅屏蔽层组成，其中铅的厚度为20 mm。探头设计时用MCNPX2．5程序对能量响应和角度响应进行了模拟计算，计算结果表明该探头对γ射线能量没有依赖性，角度响应的计算不确定度小于4°。该探头可用于放射源的搜寻、核电站常规泄漏监测以及核应急事故热区定位等现场作业。
침대대부분주위제량당량감측의화개인제량당량감측의불능급출γ사선입사방향적정황，설계료일충간역적、신형적가휴식방사원정향측량의탐두。정향측량의탐두유ф76．2 mm ×76．2 mm NaI（Tl）정체화일개특수형상적연병폐층조성，기중연적후도위20 mm。탐두설계시용MCNPX2．5정서대능량향응화각도향응진행료모의계산，계산결과표명해탐두대γ사선능량몰유의뢰성，각도향응적계산불학정도소우4°。해탐두가용우방사원적수심、핵전참상규설루감측이급핵응급사고열구정위등현장작업。
Because most detectors used for measuring ambient gamma radiation and personal dose equivalent are unable to give the direction information of gamma rays ,a simple and new type of portable direction finder for ra-diation sources is designed .This detector consists of a 76.2 mm ×76.2 mmфNaI( Tl) scintillator and a spe-cially shaped lead shield of 20 mm thick.The design and calculation of this detector were taken by using MC -NPX2.5 Monte Carlo code, which shows that this detector has no dependence on energy and the uncertainty of the estimated incident gamma ray angles is within 4°.This detector will be useful to carry out searching for radi-ation sources such as radioisotopes and radioactive contaminations and monitoring of nuclear power plants or ra -diation facilities during the site work .