用磷屏放射自显影法测量α核素的放射性活度  

Detection of Alpha Radioactivity Using Autoradiography With Phosphor Screen

作　　者：冯孝贵[1] 梁俊福[1] 章英杰[1] 王建晨[1] 陈靖[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京102201

出　　处：《核化学与放射化学》2009年第2期84-89,共6页Journal of Nuclear and Radiochemistry

摘　　要：介绍了应用磷屏放射自显影法测量α核素放射性活度的实验方法,研究分析了样品与磷屏之间距离(即立体角)、曝光时间及样品放射性活度等因素对磷屏影像光强度的影响。结果表明,经过立体角修正后得到的磷屏影像光强度与测量几何条件无关;在磷屏未饱和的前提下,磷屏影像光强度与磷屏受到的辐射成正比。另外,对曝光环境、扫描次数、磷屏本底、γ或X射线的影响、源的状况等几个在实验过程中需要注意的问题进行了讨论,并给出了相应的建议。The experimental method for detecting alpha radioactivity using autoradiography with phosphor screen was introduced in this paper. The influences of some parameters, such as the distance between the sample and the phosphor screen （or referred to solid angle）, the exposure time and the radioactivity in the sample, on the light intensity of the phosphor screen image were studied. It is shown that the light intensity after solid angle revision does not vary significantly from one geometry to another. The intensity is proportional to the exposure time and the amount of activity in the sample before the phosphor screen is saturated. In addition, several experimental issues should be paid attention to be discussed, including the exposure condition, the number of scans, the background of the phosphor screen, the influence of the gamma or X-ray and the status of the sample.

关 键 词：磷屏 放射自显影 α核素 立体角 

分 类 号：R144[医药卫生—公共卫生与预防医学]