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)
计量学报 ›› 2026, Vol. 47 ›› Issue (3) : 467-474. DOI: 10.3969/j.issn.1000-1158.2026.03.19
电离辐射计量

137Cs源空气比释动能率及国际比对结果的不确定度再评定

作者信息 +

Reevaluate the Uncertainty Air Kerma Rate of 137Cs and the International Comparison Results

Author information +
文章历史 +

摘要

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 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。

Abstract

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.

关键词

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

Key words

ionizing radiation metrology / air kerma / graphite cavity ionization chamber / international comparison / absolute value realization / dose measurement

引用本文

导出引用
刘川凤, 李德红, 黄建微, . 137Cs源空气比释动能率及国际比对结果的不确定度再评定[J]. 计量学报. 2026, 47(3): 467-474 https://doi.org/10.3969/j.issn.1000-1158.2026.03.19
LIU Chuanfeng, LI Dehong, HUANG Jianwei, et al. Reevaluate the Uncertainty Air Kerma Rate of 137Cs and the International Comparison Results[J]. Acta Metrologica Sinica. 2026, 47(3): 467-474 https://doi.org/10.3969/j.issn.1000-1158.2026.03.19
中图分类号: TB98   

参考文献

[1]
宋一鸣, 周倩倩, 陈晔, 等. 基于γ能谱反演的弱峰检测方法探讨 [J]. 原子能科学技术202458(10):2228-2238.
SONG Y M ZHOU Q Q CHEN Y, et al. Exploration of Weak Peak Detection Method Based on Gamma Spectra Deconvolution[J]. Atomic Energy Science and Technology202458(10):2228-2238.
[2]
祝娇, 沈明明, 张淮超,等. 治疗水平γ辐射空气比释动能率标准装置的研制与建立 [J]. 计量与测试技术202047 (9): 49-52.
ZHU J SHEN M M ZHANG H C, et al. Development and Establishment of A Standard Device for Gamma Radiation Air Kerma Rate Used in Radiotherapy[J]. Meaurement and Testing Technology202047(9):49-52.
[3]
KESSLER C BURNS D T ALVAREZ J T, et al. Key Comparison BIPM.RI(I)-K5 of the air kerma standards of the ININ, Mexico and the BIPM in 137Cs gamma radiation[J]. Metrologia201552(1A):06020.
[4]
KIM I J YI C Y DÍAZ N C, et al. APMP key comparison report of air kerma for 137Cs (APMP.RI(I)-K5)[J]. Metrologia202259(1A):06003.
[5]
SELTZER S M FERNÁNDEZ-VAREA J M ANDREO P, et al. Key data for ionizaing-radiation dosimetry: measurement standards and applications: ICRU 90[R]. Boston: Oxford University Press, 2016.
[6]
王志鹏, 王坤, 金孙均, 等. 医用电子束水吸收剂量测量及其不确定度讨论[J]. 计量学报202344(12):1897-1903.
WANG Z P WANG K JIN S J, et al. Measurements of Absorbed Dose to Water in Medical Electron Beams and Discussion of Its Uncertainty[J]. Acta Metrologica Sinica202344(12):1897-1903.
[7]
RINDHATAYATHON P SIRIWITPREECHA A PUNGKUN V. Establishing of primary standard for Cs-137 air-kerma of OAP, Thailand[J].Applied Radiation and Isotopes2021(8):109586
[8]
SHARMA S D KUMAR S SRINIVASAN P,et al. Establishment of air kerma reference standard for low dose rate Cs-137 brachytherapy sources[J]. Journal of Applied Clinical Medical Physics201112(4):275-285.
[9]
CORNEJO DIAZ N A. New LMRI CIEMAT primary standard for Cs-137 air-kerma[J]. Measurement2022188(1):1-8.
[10]
BURNS D. An analysis of existing data for W airI c and the product W air s c,air [J]. Metrologia201249:507-512.
[11]
ALLISY-ROBERTS P J BURNS D T KESSLER C. Measuring conditions and uncertainties for the comparison and calibration of national dosimetric standards at the BIPM:BIPM-2024/04[R]. France: Bureau International des Poids et Mesures, Sèvres, 2024.
[12]
ANKERHOLD U BEHRENS R DOMBROWSKI H, et al. Progress Report of the Department ‘Radiation Protection Dosimetry’:CCRI(I)/07-22[R]. Pair, France: Bureau International des Poids et Mesures, 2007.
[13]
李德红, 王培玮, 邬蒙蒙, 等。 137Cs γ射线空气比释动能基准石墨空腔电离室的研制[J]. 计量学报201637(3):323-327.
LI D H WANG P W WU M M, et al. Construction on Graphite Cavity Ionization Chamber as Air Kerma Primary Standard for 137Cs γ Rays[J]. Acta Metrologica Sinica201637(3):323-327.
[14]
李德红, 王培玮, 成建波. 137Cs γ射线空气比释动能率的国际关键比对[J]. 原子能科学技术201650(2):332-337.
LI D H WANG P W CHENG J B. Internation Key Comparison of Air Kerma Rate in 137Cs γ Ray[J]. Atomic Energy Science and Technology201650(2):332-337.
[15]
CCRI. Corrections to air kerma standards[C]//18th meeting of the CCRI. Paris, France, 2003.
[16]
RASMUSSEN B E DAVIS S D SCHMIDT C R,et al. Comparison of air-kerma strength determinations for HDR 192Ir sources[J]. Medical Physics201138(12):6721-6729.
[17]
MAGHRABY A M. Efficiencies of Some Spherical on Chambers in Continuous and Pulsed Radiation: A Numerical Evaluation[J]. Journal of Radiology201580:515-522.
[18]
赵瑞, 吴金杰, 文玉琴, 等. 60~250 kV治疗水平X射线空气比释动能量值国内比对 [J]. 计量科学与技术202266 (5): 55-60
ZHAO R WU J J WEN Y Q, et al. Comparison of Air Kerma Value of X-ray at 60~250 kV Therapeutic Level inChina[J]. Metrology Science and Technology202266(5):55-60.
[19]
KESSLER C ROGER P ALLISY-ROBERTS P J, et al. Comparison of the standards for air kerma of the KRISS and the BIPM for 137Cs gamma radiation[J].Metrologia2010, 47(Tech Suppl): 06022.
[20]
ALLISY-ROBERTS P J KESSLER C BURNS D T, et al. Summary of the BIPM.RI(I)-K5 comparison for air kerma in 137Cs gamma radiation[J]. Metrologia2013, 50(Tech Suppl): 06001.
[21]
BURNS D T BUTLER D. Update report on the evaluation of degree of equivalence in regional dosimetry comparisons: CCRI(I)-17-09 [R]. 2017.
[22]
KESSLER C SAITO N KUROSAWA T. Key comparison BIPM.RI(I)-K5 for the air kerma standards of the NMIJ, Japan and the BIPM in 137Cs gamma radiation[J]. Metrologia201350: 06022.
[23]
International Organization for Standardization. Uncertainty of measurement—Part 3: Guide to expression of uncertainty in measurement (GUM:1995): ISO-IEC GUIDE 98-3-2008 [S]. Switzerland: ISO copyright office, 2008.
[24]
SUTTON C M. Analysis and linking of international measurement comparisons[J]. Metrologia200441(4):272.

基金

中国计量科学研究院基本科研业务费(AKYCX2306)

PDF(961 KB)

Accesses

Citation

Detail

段落导航
相关文章

/