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利用14MeV中子活化分析农作物种子、采用三种不同的探测系统对小麦、黄豆中的N、P、K元素进行了分析。我们采用了通常的相对比较法,待测元素含量由式W_x=(φ_x·A_x/φ_s·A_s)·W_s计算,式中φ_x和φ_s分别为辐照过程中样品和标样所接受的中子通量;A_s和A_x分别为标样和样品中待测元素特征峰面积。针对0.511峰具有较复杂来源的特点,采用符合-多定标解衰变曲线的方法,以排除干扰。N、P、K经活化均产生0.511MeVγ射线。
Using 14MeV neutron activation analysis of crop seeds, N, P and K elements in wheat and soybean were analyzed by using three different detection systems. We use the usual relative comparison method, the content of the element under test is calculated by the formula W_x = (φ_x · A_x / φ_s · A_s) · W_s, where φ_x and φ_s are the neutron Flux; A_s and A_x respectively for the standard sample and sample elements to be measured peak area. For the 0.511 peak has a more complex source of characteristics, the use of multi-standard solution decay curve method to eliminate interference. N, P, K were activated to produce 0.511 MeV gamma rays.