241Am俘获反应中242Cmα粒子测量方法研究

摘要

241 Am 发生中子俘获反应，主要生成激发态的242 Amg （83．7％），242 Amg通过β衰变生成242 Cm，242 Cmα粒子的最低能量比241 Amα粒子的最高能量高约500 keV。用SRIM程序模拟了两种能量的α粒子在铝箔中的穿透情况，26μm的Al箔可以将241 Am的α粒子完全吸收掉，242 Cm的α粒子对26μm的Al箔穿透率达99．7％。在探测器前加26μm吸收铝箔，可以排除241 Amα粒子对242 Cm的α粒子测量的影响，实现242 Cmα粒子的测量。%241Am Capture neutron, the offspring nucleus mostly is 242Amg(83.7%), 242Amg creates 242Cm by βdisintegration , the lowest energy of αparticle of 242 Cm are 500 keV higher than the highest energy of αparticle of 241 Am.Penetrating power of αparticle in Al were simulated by SRIM program , 26μm thick Al foil can com-pletely imbibe the αparticle of 241 Am, the penetrating rate of αparticle of 242 Cm through 26μm thick Al foil is 99.7%.So, 26 μm thick Al foil could eliminate the impact of αparticle of 241 Am, achieving measurement ofαparticle of 242 Cm.