【作者】 石国柱； 李松林； 陈若富； 秦芝； 雷富安； 李恒远； 沈爱花； 程宏生；

【Author】 SHI Guo-zhu,LI Song-lin,Chen Ruo-fu,Qin zhi, Lei Fu-an,LI Heng-yuan,Shen Ai-hua,Cheng Hong-sheng (Institute of Modern Physics, Chinese Academy of Sciences, LanZhou 730000, China)

【机构】 中国科学院近代物理研究所；

【摘要】 采用近代物理研究所自行生长的铊激活碘化铯晶体,以日本Hamamatsu公司生产的高灵敏度光电倍增管R7724耦合为探头,并配以自主研发的前端电子学和数据采集系统,研制出一款高精度测钾仪。通过对40K能量为1.461MeVγ射线的测量,确定了探测器的放大倍数和阈值。采用放射性法与重量法,在完全无屏蔽条件(300s)下测高含量钾盐,测量结果对比,其相对误差≤13.22%;在简单屏蔽条件下,延长测量时间(600s)测低含量钾盐,两种测量方法相对误差≤10%。上述结果表明,利用我们研制的测钾仪测量40Kγ辐射,对粉末状固体钾盐样品的钾含量进行即时快速测定是可行的。更多还原

【Abstract】 An instrument for high-accuracy detection of potassium (K) through measuring the γ-ray of 40K at 1.461MeV in sample were developed based on the CsI(Tl) crystal grown at Institute of Modern Physics coupled with the high sensitive Hamamastu R7724 photomultiplier tube (PMT) and the front-end electronics and data acquisition system. The amplification factor and the threshold value of the detector for measuring 40K were determined. The relative error between the result measured by radioactivity method and weighting method is ≤13.22% when the high levels of K content was measured using the developed K detector (measuring time=300s) under the condition of no shielding. However, when the low levels of potassium content were measured under the simple shielding condition and extension of time (measuring time=600s), the relative error between two kinds of measuring methods is ≤ 10%. These results showed that the developed K detector was a useful instrument to rapid measure the content of the potassium in material.更多还原