天然石材放射性核素的HPGe快速分析研究

根据天然石材226Ra、232Th与其子体是处于放射性平衡的特点,研究了制样过程对226Ra与其子体平衡过程的影响.发现样品盒里样品装得越满,初始平衡度越高,增长系数越大;当样品上面的空间为零时,初始平衡度最高,增长系数可达到理论值.多种不同石材实验还表明,不同石材226Ra子体增长曲线很接近,意味着未平衡时的测量结果与平衡时的测定值有很好的确定性关系.还给出了不同平衡时间的校正因子.此方法有可能推广到建材等放射性检测,只要能确认样品未粉碎前226Ra、232Th与各自子体处于放射性平衡.

Quick analysis of radionuclide in natural rocks using HPGe

Influence of samples processing on the equilibrium of ~(226)Ra and with its daughter nuclides has been studied based on radioactivity equilibrium between ~(226)Ra and ~(232)Th with its daughter nuclides.It can be observed that the more the amount samples in a vial the higher the initiate equilibrium and increasing coefficient.Testing different rocks shows that they have similar curves for ~(226)Ra daughter nuclide increase,suggesting that there is a good relationship before and after the equilibrium.Calibration factors for the different equilibrium time are also present in this paper.This method may be recommended to be used in monitoring radioactivity of constructive materials only necessary to make sure the equilibrium of ~(226)Ra and ~(232)Th with its daughter nuclides has reached before the crushing materials.