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用于近距离放射治疗源校准的新开发的井型电离室的剂量学评估。

Dosimetric evaluation of newly developed well-type ionization chamber for use in the calibration of brachytherapy sources.

作者信息

Saminathan Sathiyan, Godson Henry Finlay, Ponmalar Retna, Manickam Ravikumar, Mazarello James

机构信息

Department of Radiation Physics, Kidwai Memorial Institute of Oncology, Bengaluru, Karnataka, India.

ROSALINA India Private Limited, Mumbai, Maharashtra, India.

出版信息

J Med Phys. 2016 Oct-Dec;41(4):234-239. doi: 10.4103/0971-6203.195187.

DOI:10.4103/0971-6203.195187
PMID:28144115
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5228046/
Abstract

The well-type ionization chamber has been designed for convenient use in brachytherapy source strength calibration. The chamber has a volume of 240 cm, weight of 2.5 kg, and is open to atmospheric conditions. The well-type ionization chamber dosimetric characteristics such as leakage current, stability, scattering effect, ion collection efficiency, and nominal response with energy were studied. The evaluated dosimetric characteristics of well-type ionization chamber were compared with two other commercially available well-type ionization chambers. The study shows that the newly developed well-type ionization chamber is reliable for air-kerma strength calibration. The results obtained confirm that this chamber can be used for the calibrations of high-dose rate brachytherapy sources.

摘要

井型电离室专为近距离放射治疗源强度校准的便捷使用而设计。该电离室体积为240立方厘米，重量为2.5千克，且对大气环境开放。研究了井型电离室的剂量学特性，如漏电流、稳定性、散射效应、离子收集效率以及随能量的标称响应。将评估得到的井型电离室剂量学特性与另外两种市售井型电离室进行了比较。研究表明，新开发的井型电离室在空气比释动能强度校准方面是可靠的。所得结果证实该电离室可用于高剂量率近距离放射治疗源的校准。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1294/5228046/274971f6a274/JMP-41-234-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1294/5228046/7580beed1304/JMP-41-234-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1294/5228046/e3680c0c8fca/JMP-41-234-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1294/5228046/274971f6a274/JMP-41-234-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1294/5228046/7580beed1304/JMP-41-234-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1294/5228046/e3680c0c8fca/JMP-41-234-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1294/5228046/274971f6a274/JMP-41-234-g010.jpg

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本文引用的文献

1
A radiation quality correction factor k for well-type ionization chambers for the measurement of the reference air kerma rate of (60)Co HDR brachytherapy sources.用于测量（60）Co高剂量率近距离治疗源参考空气比释动能率的井型电离室的辐射质修正因子k 。
Med Phys. 2015 Jul;42(7):4285-94. doi: 10.1118/1.4922684.
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Comparison of air-kerma strength determinations for HDR (192)Ir sources.比较 HDR（192）Ir 源的空气比释动能强度测定。
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Long term response stability of a well-type ionization chamber used in calibration of high dose rate brachytherapy sources.
用于高剂量率近距离治疗源校准的井型电离室的长期响应稳定性。
J Med Phys. 2010 Apr;35(2):100-3. doi: 10.4103/0971-6203.62200.
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In-air calibration of an HDR 192Ir brachytherapy source using therapy ion chambers.使用治疗电离室对高剂量率192铱近距离治疗源进行空气校准。
J Cancer Res Ther. 2005 Oct-Dec;1(4):213-20. doi: 10.4103/0973-1482.19590.
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