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137Cs源空气比释动能率及国际比对结果的不确定度再评定
刘川凤, 李德红, 黄建微, 吕雅竹, 成建波, 史泰玮, 杨智君
计量学报 ›› 2026, Vol. 47 ›› Issue (3) : 467-474.
PDF(961 KB)
PDF(961 KB)
137Cs源空气比释动能率及国际比对结果的不确定度再评定
Reevaluate the Uncertainty Air Kerma Rate of 137Cs and the International Comparison Results
ICRU 90号报告对电离辐射领域的部分关键物理量提出了修改建议,基于ICRU 90号报告提出的物理量值,对137Cs放射源空气比释动能率值及2014年的国际比对结果的不确定度重新开展评定,重点研究空气比释动能、量值传递中的校准因子的变化及国际比对结果的等效性。ICRU 90号报告,将干燥空气中W air(产生1个离子对的平均能量)的相对标准不确定度由0.15%变化为0.35%,量值仍保持在33.97 eV,且W air与 s g,air(石墨到空气的阻止本领比)的乘积值发生改变。计算得到新的137Cs空气比释动能率与先前的值之比为0.992,同时其相对标准不确定度由0.25%变化为0.27%;对于量值传递电离室,校准因子变为原来的0.992倍,相对不确定度未受到显著变化,仍为0.30%。国际比对结果的等效性Di 未发生变化,其不确定度Ui 值变大,比对结果仍具有国际等效性。
ICRU Report No.90 has made relevant modifications and recommendations on the partial key physical quantities in the field of ionization radiation. The study will investigate the change of the air kerma of 137Cs source, the calibration factor during the calibration process based on the physical quantities proposed in the report ICRU 90. And the international comparison results in 2014 was recalculated to evaluate the equivalence of comparison result. In the report, the uncertainty of average energy to create an ion pair in air (W air) for the dry air increases from 0.15% to 0.35%, at the same time, the value remains at 33.97 eV. And the product of W air and s g,air(the graphite to air stopping-power ratio) is changed. The value of the air kerma for 137Cs source decreased to 0.992 times the original. Meanwhile the relative standard uncertainty has increased from 0.25% to 0.27%. For the transfer ionization chamber, the calibration factor has decreased to 0.992 times its original value. And the relative standard uncertainty of the calibration factor has not significantly changed, which still is 0.30%. The equivalent Di of the comparison result has not changed, and its uncertainty Ui has increased. The international comparison result still has international equivalence.
电离辐射计量 / 空气比释动能率 / 石墨空腔电离室 / 国际比对 / 量值复现 / 剂量测量
ionizing radiation metrology / air kerma / graphite cavity ionization chamber / international comparison / absolute value realization / dose measurement
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