CAJ | 학술논문

能量低于300 keV且能谱简单的稳定放射性核素较少，作为替代，利用X射线机产生X射线，并经过不同厚度的材料的过滤，可以得到用于对辐射防护仪器进行校准和确定其能量响应和角响应的一系列规定辐射质的参考辐射。由于材料的质量衰减系数与X射线在物质中各种作用过程有关，并强烈的依赖于光子的能量，基于这一物理现象，可以通过X射线在物质中的衰减规律，计算产生规定辐射质的过滤材料的厚度。针对过滤材料的厚度这一问题，本文运用Geant4程序模拟了不同能量的电子打靶，统计韧致辐射的X射线，以获得计算所需X射线能谱，再由文中滤片厚度计算方法，计算产生规定辐射质过滤材料的厚度。模拟计算的结果显示，过滤后的X射线能谱能够很好的满足标准要求，从而验证了能谱过滤的理论计算的合理性。
능량저우300 keV차능보간단적은정방사성핵소교소，작위체대，이용X사선궤산생X사선，병경과불동후도적재료적과려，가이득도용우대복사방호의기진행교준화학정기능량향응화각향응적일계렬규정복사질적삼고복사。유우재료적질량쇠감계수여X사선재물질중각충작용과정유관，병강렬적의뢰우광자적능량，기우저일물리현상，가이통과X사선재물질중적쇠감규률，계산산생규정복사질적과려재료적후도。침대과려재료적후도저일문제，본문운용Geant4정서모의료불동능량적전자타파，통계인치복사적X사선，이획득계산소수X사선능보，재유문중려편후도계산방법，계산산생규정복사질과려재료적후도。모의계산적결과현시，과려후적X사선능보능구흔호적만족표준요구，종이험증료능보과려적이론계산적합이성。
X-ray machine is often used to produce the X-ray instead of a few stable primordial radionuclides for the energy spectrum below 300 keV.A series of specialized X-ray spectrum can be obtained to calibrate and determine the energy response and angular response of radiation detector by setting several layers of filters. These filter sheets are used to filter original X-ray spectrum with a certain distribution.The mass attenuation coefficient strongly depends on the energy of the photons.Based on X-ray attenuation in material, this paper describes a method to calculate the thicknesses of filters.Monte Carlo code Geant4 was used to simulate brems-strahlung produced by electrons hitting the anode target.The X-ray from bremsstrahlung was calculated as well.After X-ray spectrums were obtained, the thickness of the lead and tin filter sheet were calculated ac-cording to the paper.The results show that the optimized X-ray spectrum agrees with the standards very well. It demonstrates the correctness of the theoretical calculation of spectrum filtering.