| LUO Su-ming,LI Jing-yun,HE Zhi-jian.Development of a well- type chamber for measurement of source activation in breachtherapy[J].Chinese Journal of Radiological Medicine and Protection,2005,25(4):370-373 |
| Development of a well- type chamber for measurement of source activation in breachtherapy |
| Received:April 24, 2005 |
| DOI： |
| KeyWords:Well-type chamber Air kerma strength of brachytherapy source Measurement accuracy of source activity |
| FundProject:北京市自然科学基金资助项目(3042016)4 |
| Author Name | Affiliation | | LUO Su-ming | National Institute for Radiological Protection, China CDC, Beijing 100088, China | | LI Jing-yun | 中国原子能科学研究院 | | HE Zhi-jian | National Institute for Radiological Protection, China CDC, Beijing 100088, China | | 朱卫国 | National Institute for Radiological Protection, China CDC, Beijing 100088, China | | 李开宝 | National Institute for Radiological Protection, China CDC, Beijing 100088, China | | 刘立明 | National Institute for Radiological Protection, China CDC, Beijing 100088, China |
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| Abstract:: |
| Objective To develop a well-type chamber air kerma strength of source for measurement and improve accuracy for source activity. Methods By drawing advanced experience from abroad and combining the condition of our country, we designed a plan, drew the blueprint, selected the material, processed and assembled the well- type chamber, and carried out a performance test. Result The imported and self-made well- type chambers were measured in the same condition for comparision. The results should that the long- term stability of the self-made well- type chamber is 0.4%, and the technique index is 2%; the recombination rate of ionized charges is 0.9995% and the technique index is 1.000; the measurement accuracy of the well-type chamber is 0.02%,and the technique index is 0.5%. For the self-made well-type chamber, the flat response of peak sensitivity is fixed while for imported one the flat response changes around 0.1% within 5 mm of peak sensitivity. Conclusions The strong points of the self-made well-type chamber are quick speed and accuracy in measurement and can measure for 192Ir, 125I and 103Pd sources. Its measurement range is from 3.7 MBq to 7.4 ×105 MBq. The development of the well-type chamber fills the gaps of on -site measurement instruments and becomes a product with independent intellectual property right in our country. |
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