| Yin Liangliang,Shao Xianzhang,Shen Baoming,et al.Determination of α-radionuclides in environmental samples by large area grid ionization chamber[J].Chinese Journal of Radiological Medicine and Protection,2015,35(6):461-464 |
| Determination of α-radionuclides in environmental samples by large area grid ionization chamber |
| Received:January 30, 2015 |
| DOI：10.3760/cma.j.issn.0254-5098.2015.06.013 |
| KeyWords:Grid ionization chamber α-emitters Environmental samples |
| FundProject:卫生行业科研专项资助项目(201002009);科技部科技支撑项目(2013BAK03B00) |
| Author Name | Affiliation | E-mail | | Yin Liangliang | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Shao Xianzhang | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Shen Baoming | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Li Yucheng | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Ji Yanqin | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | jiyanqin@nirp.cn |
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| Abstract:: |
| Objective To develop the method of analyzing α-radionuclides using large area grid ionization chamber. Methods Ultrasonic dispersion and vacuum drying system was used to prepare sample source, large standard thin source and plutonium plane source were used to optimize the working condition of spectrometer, and calibrate the instrument for analyzing α emitters. The certified reference materials (GBW04127) were used to verify the accuracy of the method. Results The non-linearity of calibration curve for standard thin sources of neptunium, plutonium and americium was less than 0.2%, and the resolution were 112, 84 and 106 keV, respectively. The counting efficiency was 31.2% for the large standard thin source. The values of specific activity measured in this way were in good agreement with those of the certified reference materials. 232Th, 238U, 230Th, 234U/226Ra, 210Po, 222Rn and 218Po were analyzed in a uranium mineral sample, and their specific radioactivity values were 5.3, 3.8, 35.6, 21.4, 27.0, 19.6 and 11.1 Bq/g, respectively. Conclusions The method can be used to analyze α spectrum quickly in low-level radioactive environmental samples. |
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