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参考辐射场中,参考点剂量当量约定真值的确定对辐射防护用仪器仪表校准有着重要的意义。目前国际上确定该值有两种通用的方法:1)通过剂量当量电离室直接测量得到(包括个人剂量当量电离室和周围剂量当量电离室);2)通过能谱测量得到某一参考辐射点空气比释动能到剂量当量的转换系数,进而确定该点剂量当量约定真值。与通过电离室直接测量剂量当量方法相比,后者更为基础也更加准确。
Reference radiation field, the reference point dose equivalent to determine the true value of the instrument calibration of radiation protection has important significance. There are currently two general methods to determine this value internationally: 1) direct measurement through dose-equivalent ionization chamber (including personal dose equivalent ionization chamber and surrounding dose-equivalent ionization chamber), 2) measurement by energy spectrum of a reference radiation point Air ratio of kerma to dose equivalent conversion factor, and then determine the point equivalent dose of truth. The latter is more fundamental and more accurate than the method of directly measuring the dose equivalent through the ionization chamber.