物质对β射线的吸收PB07203145闫寒物质对β射线的吸收数据处理1.计数管坪曲线计数时间为10s,得到结果见下表:工作电压和计数结果数据工作电压/11.5v113.6115.6117.6119.6121.6123.6125.6127.6129.6工作电压/v1306.41329.41352.41375.41398.41421.41444.41467.41490.4计数结果N032453467365036123751375537283889E=1/(N)1/20.020.020.020.020.020.020.020.02NE=(N)1/256.9658.8860.4260.1061.2561.2861.0662.36工作电压/11.5v131.6133.6135.6137.6139.6141.6143.6145.6工作电压/v1513.41536.41559.41582.41605.41628.41651.41674.4计数结果37893842388538683938397839824061E=1/(N)1/20.020.020.020.020.020.020.020.02NE=(N)1/261.5561.9862.3362.1962.7563.0763.1063.73由此作出曲线图如下:1/6物质对β射线的吸收PB07203145闫寒取点(1375.4,3650)和点(1651.4,3982)为计算用点,得结果如下:工作电压:坪长:坪斜率为:由于T<0.1%/v,故该结果可用2.铝片厚度的计算厚铝片的数据如下:厚片(3550mg)数据长/cm宽/cm面积/cm^2质量厚度mg/cm^26.005.2031.20113.786.055.2531.76111.776.025.2031.30113.406.005.1831.08114.225.954.9529.45120.53长度的平均值及不确定度:宽度的平均值及不确定度:面积的平均值及不确定度:质量厚度的平均值不确定度:薄铝片的数据如下:薄片(558mg)数据2/6物质对β射线的吸收PB07203145闫寒长/cm宽/cm面积/cm^2质量厚度mg/cm^26.054.8529.3419.025.905.0529.8018.735.884.9529.1119.176.104.7528.9819.265.905.0029.5018.92长度的平均值及不确定度:宽度的平均值及不确定度:面积的平均值及不确定度:质量厚度的平均值不确定度:3.吸收曲线的绘制在部分电压下,进行计数两次,取平均值为结果.在10s内平均计数一栏,已经减去了本底计数.本底计数为99/30=3.吸收曲线的数据如下:吸收曲线测量数据薄片个数厚片个数质量厚度mg/cm^2时间/s计数1计数2计数平均10s内平均计数误差E误差个数NI/I0误差000.00103765380137833780.00.016361.481.000000.01631019.02103300336233313328.00.017357.690.880520.01522038.0410295529242939.52936.50.018454.190.777030.01433057.0510263325782605.52602.50.019651.010.688740.01354076.07102369240523872384.00.020548.830.630980.01295095.09102113212721202117.00.021746.010.560400.012201114.7410192519401932.51929.50.022743.930.510840.01163/6物质对β射线的吸收PB07203145闫寒11133.76101872186218671...
