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医用同位素微量热计性能研究 被引量:2

The Performance of Medical Isotope Microcalorimeter
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摘要 为实现医用同位素核纯度和放射性活度的准确测量,本工作根据量热法测量原理设计一套微量热装置,包括量热系统、温控系统以及测控软件,并对装置的性能进行测试和实验验证。结果表明,同位素量热计的基线电势稳定,复现性良好。最低探测限可至3.1μW,能够实现医用同位素放射性活度测量的全覆盖。在10μW~1 mW的测量范围内,当输入热功率<100μW时,单次测量结果与输入热功率标准值之间的最大偏差<1.5%;当输入功率>100μW时,测量结果和输入热功率偏差<0.5%。利用该装置成功实现了医用同位素^(14)C样品的活度测量,测量结果与标准值在不确定度范围内相吻合,不产生放射性废物和化学废物,不破坏样品,操作简单方便。后期可通过研究测量预热和保温装置,进一步提高装置的适应能力和探测下限。 In order to achieve accurate measurement of nuclear purity and radioactive activity of medical isotopes,a set of microthermal apparatus has been designed according to the principle of calorimetry.This device consists of calorimetry system,temperature control system and measurement and control software.The performance of the device has been tested and verified by experiments.The results has shown that the baseline potential of isotope calorimeter is stable and reproducible.The minimum detection limit can reach 3.1μW,which can realize the full coverage of medical isotope radioactivity measurement.In the measurement range of 10μW~1 mW,when the input thermal power is less than 100μW,the maximum deviation between a single measurement result and the standard value of the input thermal power is less than 1.5%.When the input thermal power is greater than 100μW,the deviation between the measurement result and the standard value of the input thermal power is less than 0.5%.Using this device,the activity of medical isotope ^(14)C samples has been successfully measured.The measurement results are consistent with the standard values within the range of uncertainty.This method does not produce radioactive waste and chemical waste and does not destroy the sample with simple and convenient operation.At present,the thermal equilibrium time of the device varies greatly with the different packaging materials of the sample,which limits the application of short half-life isotope activity measurement.Subsequently,the adaptability and detection limit of the device can be further improved by studying and measuring the preheating and insulation device.
作者 罗老永 漆明森 张劲松 杨杰 许荩 LUO Laoyong;QI Mingsen;ZHANG Jinsong;YANG Jie;XU Jin(Nuclear Power Institute of China,Chengdu 610005,China)
出处 《同位素》 CAS 2022年第4期266-272,I0002,共8页 Journal of Isotopes
关键词 医用同位素 微量热计 活度测量 性能研究 medical isotope microcalorimeter activity measurement performance testing
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