验证辐射强度与距离平方反比率的实验  

Test of the Experiment for Inverse Square Law between Radioactive Intensity and Distance

作　　者：郭晨雷[1] 任赫[1] 陶韬[1] 孙文杰[1] 张高龙[1] 钱建强[1] 郝维昌[1] 崔益民[1] 李华[1] 

机构地区：[1]北京航空航天大学,北京100191

出　　处：《大学物理实验》2011年第1期35-37,41,共4页Physical Experiment of College

摘　　要：利用NaI闪烁谱仪测量了在探测器与放射源间某个距离下对应的计数率。对测量的数据分别利用等精度最小二乘法和未知参数逼近法进行了处理,观察到在某些未知参数下,最小二乘法引起的误差很大,利用未知参数逼近法得到的值能和真实值较好接近,从而验证了辐射强度与距离平方反比率。The counting rates are measured between the detector and the radioactive source by using NaI scintillator spectrometer.The experimental data are analyzed with the equal precision least square method and the unknown parameter approximation method,respectively.It is found that the least square method leads to the large error when some parameters are unknown.However,the value obtained by the unknown parameter approximation method is almost consistent with the real value,and then it verifies the inverse square law between radioactive intensity and distance.

关 键 词：平方反比率 最佳测量时间 最小二乘法 参数逼近法 

分 类 号：O432.1[机械工程—光学工程]