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.
出处
《大学物理实验》
2011年第1期35-37,41,共4页
Physical Experiment of College
关键词
平方反比率
最佳测量时间
最小二乘法
参数逼近法
inverse square law
optimum measurement time
least square method
parameter approximation method
