【摘要】 2002～2003年,国内首次采用就地伽马能谱测量方法在广东珠海市进行了面积性测量,并用该方法定量解释求得的钾、铀、钍含量用Beck公式估算了地表1m高处的吸收剂量率,同时用塑料闪烁体X γ吸收剂量率仪在相同测点做了比对测量。2种方法对比结果(514个测点)显示很好的一致性,珠海市区实测吸收剂量率和伽马能谱估算吸收剂量率平均值分别为(145.07±26.35)nGy/h和(162.10±31.51)nGy/h,计算结果与实测结果的相对误差为11.74%。更多还原

【Abstract】 Terrain gamma-ray absorption dose is an important parameter in estimating the ionization radiation environment level. Gamma-ray dose calculated by in-situ gamma-ray spectrometric data has been studied and used abroad since 1970s, and terrain dose mapping has been carried out in U.S.A, Sweden and Russia. In China, gamma-ray spectrometer survey was carried out in Zhuhai, Guangdong Province, from 2002 to 2003. The dose rate was calculated by Beck Expression using concentrations of ²³⁸U,²³²Th and ⁴⁰K measured by in-situ spectrometer. The results coincide with the gamma-ray dose measured by dosemeter. The measured and calculated average dose rates are （144.86±27.21） nGy/h and （136.34±26.71） nGy/h, respectively, in Zhuhai City.更多还原