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| A study for measuring radionuclides in whole diet by gamma spectrometry |
| PANG Chaoya, TUO Fei, YANG Baolu |
| National Institute for Radiological Protection, China CDC, Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, Beijing 100088 China |
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Abstract Objective Establishing a method for measuring the activity concentration of radionuclides in whole diet based on a broad-energy HPGe detector BE5030 model.Methods Whole diet samples were collected by "Dupllicate Portion Technique" and were measured by a broad-energy HPGe gamma spectrometer BE5030 model. The reliability of source-less efficiency calibration was verified by measuring a rice powder standard source with two different calibration methods. The efficiency calibration was carried out with LabSOCS software, and the activity concentration and daily intake of radionuclides in the samples were calculated.Results The results of source-less efficiency calibration were acceptable. Natural radionuclides 226Ra and 40K were detected in all the samples, the average activity concentration were 0.31 and 141 Bq/kg (dry weight), and the average daily intake was 0.21 and 95 Bq/d, respectively. 238U and artificial radionuclide 137Cs were not detected. 210Pb and 228Ra were detected in some samples.Conclusion The source-less calibration technique based on LabSOCS software could better simulated the detection efficiency and could be used to calibrate the efficiency for whole diet samples. The activity concentration of all radionuclides detected were within the national standard limits. Further research remain to be done in order to homogenize whole diet samples better and establish a "whole diet element library".
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Received: 22 April 2018
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