A new empirical method for in situ determination of the inventory of ¹³⁷Cs in soil (A_Cs, kBq m⁻²) at grasslands and forests using a field-portable NaI(Tl) scintillation spectrometer-dosimeter was developed. The method is based on evaluation of the ambient dose equivalent build-up factor. The practical implementation of the new method with the spectrometer-dosimeter does not require a priori knowledge of the vertical distribution of ¹³⁷Cs in soil. Moreover, the method allows assessing a value of the mean migration depth of ¹³⁷Cs in soil (Z) in terms of g cm⁻². The 95% confidence interval for the mean value of the conversion coefficients from the ambient dose equivalent build-up factor to A_Cs and to Z is less than 10%. The new method has been developed and verified using published data that where obtained at territories in Russia and Belarus heavily contaminated with ¹³⁷Cs (A_Cs > 37 kBq m⁻²) due to the Chernobyl accident. Therefore, the survey of less contaminated areas requires additional validation of this method.

为一个新的经验方法原位确定的库存^137个中土壤CS（甲_铯，KBQ米^-2在使用现场便携式的NaI（Tl）闪烁分光计-剂量计草地和森林）的开发。该方法基于对环境剂量当量累积因子的评估。用分光光度计-剂量计实际实施新方法不需要先验知识即可了解土壤中¹³⁷ Cs的垂直分布。此外，该方法允许以g cm ^-2来评估土壤（Z）中¹³⁷ Cs的平均迁移深度的值。。从环境剂量当量累积因子到A _Cs和Z的转换系数平均值的95％置信区间小于10％。已经使用已公开的数据开发并验证了该新方法，该数据是在俄罗斯和白俄罗斯因切尔诺贝利事故而严重污染¹³⁷ Cs（A _Cs  > 37 kBq m ^-2）的地区获得的。因此，对污染较少的区域进行调查需要对该方法进行额外的验证。