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为执行国际辐射单位与测量委员会（ Ｉ Ｃ Ｒ Ｕ） 的建议，在光子外照射环境和个人剂量监测中使用实用量，研究周围剂量当量 Ｈ（１０） 与空气比释动能 Ｋａ 之间的转换系数。方法是用直径３０ｃｍ 的聚乙烯球代替 Ｉ Ｃ Ｒ Ｕ 球，利用热释光探测器测量球表面与球内深度１０ｍ ｍ 处两位置的空气比释动能，经过一些必要的修正，将测量结果转化为 Ｉ Ｃ Ｒ Ｕ 球内的剂量值。在 Ｉ Ｓ Ｏ４０３７ 规范的窄谱 Ｘ 射线和１３７ Ｃｓ 、６０ Ｃｏ γ射线准平行束照射条件下，测量了 Ｈ（１０）／ Ｋａ 的值，分析了测量中不确定度的来源及其大小，转换系数的总不确定度为３２ ％ 。本文还与有关文献报道结果作了比较和分析。表明测量结果与理论计算值在误差范围内一致，转换因子可用于环境监测仪和个人剂量计的刻度。
In order to implement the recommendations of the International Commission on Radiological Units and Measurements (I C R U), practical quantities were used in the photon external exposure environment and personal dose monitoring to study the conversion between the surrounding dose equivalent H * (10) and the air kerma Ka coefficient. The method is to replace the I C R U sphere with a polyethylene ball with a diameter of 30 cm and measure the air kermance of the air at both the surface of the sphere and the ball at a depth of 10 m m by means of a thermoluminescence detector. After some necessary corrections, Is the dose in I C R U sphere. The value of H * (10) / Ka was measured under the condition of narrow-spectrum X-ray and I-O4037 standard quasi-parallel beam with 137 Cs and 60 Co γ rays. The source of the uncertainty and its size were analyzed. The total uncertainty of the conversion coefficient is 3.2%. The article also compared with the results reported in the literature. This shows that the measured results agree well with the theoretical values within the error range. The conversion factor can be used for the calibration of environmental monitors and personal dosimeters.