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采用化学接枝聚合法制备了聚丙烯酸铅辐射防护材料,利用傅里叶变换红外光谱仪(FT-IR)和扫描电镜(SEM)对其结构进行了分析,并利用多道γ谱仪测量了其屏蔽率.利用EGSnrc软件,通过蒙特卡罗模拟,理论计算了防护材料的屏蔽率,讨论了引入样品前后,注量和剂量的变化规律.结果表明:制备的防护材料具有优良的屏蔽性能,其屏蔽效果与射线能量有关.在纯空气介质中,注量和剂量的变化均与粒子能量相关,注量随深度成不连续的阶梯分布,梯高相等,梯宽逐渐变窄,剂量随深度缓慢增加.样品引入后,在空气介质区域,注量和剂量的变化不再与能量相关,而与样品的厚度有关.样品介质区域和空气介质区域的注量都成非线性变化,注量和剂量的变化率在样品与空气分界处,出现了明显的转折.
Poly (lead acrylate) radiation protection materials were prepared by chemical graft polymerization. Their structures were analyzed by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The multi-channel gamma spectrometer Shielding rate.The shielding ratio of shielding material was calculated theoretically by Monte Carlo simulation with EGSnrc software.The variation of the fluence and dosage before and after the introduction of the sample was discussed.The results showed that the prepared shielding material has excellent shielding performance, The shielding effect is related to the energy of the radiation.In the pure air medium, the changes of the fluence and dose are related to the energy of the particles, the fluence is discontinuous with the depth of the ladder, the height of the ladder is equal, the width of the ladder narrows gradually, .After the sample was introduced, the changes of fluence and dose were no longer related to the energy, but related to the thickness of the sample in the area of air medium.The fluency of samples and air medium area all changed nonlinearly.The fluence and dose The rate of change in the sample and the air boundary, there has been a clear turning point.