An investigation of abnormal personal doses of external exposure / 中国辐射卫生

Objective A case of abnormal personal doses of external exposure was reported in this paper. According to the investigation of the dose rates of the radiation sources and the workplace, the actualdose was estimated correctly. Methods The radiation level of storage containers at work site was measured by BH3103A portable X and γ radiation dosimeter. The thermoluminescence personal dosimeter was placed in the work site for a month, then it was measured with the RGD3 dosimeter to estimate the dose rateat the work site. The actual personal dose of external exposure was calculated based on the dose rateand the effective working time of the staff in the field. Results The location with highest dose rate was the empty containers which had been filled with raw materials. The second was a container filled with ingredients. The dose rate on the surface of empty container is generally higher than that of full container. The time weighted method was used to calculate the possible dose which was 2.32 mSv for this position. Conclusion The personal dose measured by the personal dosimeter was found to be erroneous, and it should be recorded with the revised dose of 2.32 mSv.

The impact of Japanese Fukushima nuclear accident on environmental radiation levels in some areas of Liaoning province / 中华放射医学与防护杂志

Objective To investigate the environmental impact of the Japanese Fukushima No.1 nuclear power plant accident on radiation levels in some areas of Liaoning province.Methods The emergent monitoring was performed by detecting atmosphere aerosols,precipitations,drinking water,vegetables,milk and seafood by gamma spectrometry analysis and gross activity measurements.Results The fission radionuclides of 131I,134Cs and 137Cs were detected in atmosphere aerosols 20 d after nuclear accident.The rad ionuclides of 131I,134Cs and 137Cs were found existing in atmosphere for 25,4 and 6 d,respectively,with the highest concentrations of 4.6 × 10 3,2.9 × 10-4 and 4.2 × 10-4 Bq/m3,respectively.The man-made fission radionuclides could not be detected in vegetablcs,drinking water and milk from Shenyang city and seafood from Dandong city.Conclusions The atmosphere might be slightly contaminated in Liaoning province due to the nuclear accident,whereas the vegetables,milk and drinking water not contaminated.