RADIATION PROTECTION BULLETIN

Arrangements for Radiation Protection of Remediation Workers in Off-site Contaminated Areas at the Fukushima Daiichi NPP

Wang Xudong

RADIATION PROTECTION BULLETIN. 2014, 34(6): 1-5.

Abstract ( 29 )

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An overview of Ordinance on Prevention of Ionizing Radiation Hazards at Works to Decontaminate Soil and Wastes Contaminated by Radioactive Materials Resulting from the Great East Japan Earthquake and Related Works presented, along with the relevant guidelines. Their implementation in Fukushima Prefecture in the year of 2013 is also summarized. It seems that efforts of Japan to cope with radiation protection of remediation workers in contaminated areas off-site are far from having been turned into good practices.

Discussion on Technology of Light Water Detritiation at PWRs

Weng Wenqing, Long Jingjing, Lü Yonghong

RADIATION PROTECTION BULLETIN. 2014, 34(6): 6-10.

Abstract ( 30 )

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Combining the discharge amount of tritiated water at PWRs, the applicability of several hydrogen-water exchange technologies which already have large-scale industrial applications is discussed, and the CECE process is believed to be more applicable than other detritiation technology.

Development of Environmental Radioactive MeasurementReference Material

Yang Jia, Xiang Yuanyi, Liu Hongshi, Yang Yang, Wang Xingang, Wang Kebin, Liu Gongye

RADIATION PROTECTION BULLETIN. 2014, 34(6): 11-16.

Abstract ( 19 )

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Reference samples were developed for environmental radioactive measurement. The collected soils were undergo drying, crushing, sieving and seven days uninterrupted mixing, sampling in bottle and between bottles. Gamma spectrometer was used to measure ²²⁶Ra and ²³²Th. Both t-test and F-test were used for homogeneity testing and the results showed that samples collected were homogeneity when sampled amount was less than 100 g. The samples were distributed to 29 units for comparison, with Z score evaluation applied to the results. Grubbs rule was used to eliminate the abnormal data before setting the value. Results show that the developed reference samples can be widely used in environmental radioactivity measurements.

Effects of Heavy-ion Irradiation on Cell Apoptosis of Human Peripheral Blood Lymphocytes

Liu Hongyan, Zhang Huifang, Liu Jiangong, Dang Xuhong, Yuan Yayi, Wang Chao

RADIATION PROTECTION BULLETIN. 2014, 34(6): 17-19.

Abstract ( 20 )

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This paper is to explore effects of ¹²C ions beam exposure on cell apoptosis of lymphocytes. Human peripheral blood lymphocytes Peng-EBV were exposed to ¹²C ions beams at different doses (0 Gy, 0.5 Gy, 2.0 Gy) at the dose rate of 0.3-0.5 Gy/min. Cell apoptosis was detected by using flow cytometry (FCM) at 12, 24, 48 hours, 20, 30 day post irradiation. Apoptosis occurred at 12 hour post irradiation, and at 24 hour the rate of apoptosis was the highest, an obvious drop appeared at 48 hour post irradiation, a recovery from ¹²C ion-induced apoptosis at 30 day post irradiation. The mumber of apoptotic and necrotic in Human peripheral blood lymphocytes at 12, 24, 48 hour post irradiation signilificantly increased compared with the control; Apoptosis irradiated by 2.0 Gy of ¹²C ions was slightly larger than the 0.5 Gy, and has a long time. These results suggest that¹²Cion beam exposure can induce lymphocytes apoptosis and necrosis, and it is related to the dose and time.

Radioactivity Level in the Environment around Xi'an Pulsed Reactor in 2006-2010

Li Hua, Yu Qinyu, Tang Xiuhuan, Zhang Jihong, Ma Yan Song, Xiaojing

RADIATION PROTECTION BULLETIN. 2014, 34(6): 20-24.

Abstract ( 36 )

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The results of radioactivity monitoring of environmental media such as air, water, representative biomaterial, and soil during 2006 to 2010 were presented. The average concentrations of total α, total β in the air aerosol were 0.1, 0.6 Bq/m³. Total α, total β and ¹³⁷Cs in surface water averaged 101.4, 249.8, 2.4 mBq/L, while corresponding values in underground water and biomaterial were 46.7, 90.4, 2.1 mBq/L, and 0.6, 58.2, 2.2×10^-2 Bq/kg(wet), respectively. In soil, the average levels of total α, total β, ¹³⁷Cs, ²²⁶Ra, ²³²Th and ⁴⁰K were 386, 793, 3.0, 36, 48, 548 Bq/kg(dry), respectively.

Discussion on Recycling Waste Metal Smelting Radiation Monitoring Problem

He Zeyong

RADIATION PROTECTION BULLETIN. 2014, 34(6): 25-27.

Abstract ( 31 )

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This paper introduces the source of the waste metals and radioactive substances, ways of radioactive substances into the metal products and the resulting radiation types. Then, the analysis of existing problems in the scrap metal radiation monitoring ,the corresponding countermeasure and the measure is given.

Decay Correction in Short Half-life Radionuclide Measurement

Song Haiqing, Chen Wentao, Zhang Yanjing, Li Qiaoqin, Mo Guanghua

RADIATION PROTECTION BULLETIN. 2014, 34(6): 28-31.

Abstract ( 26 )

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The decay correction methods in measurement of short half-life radionuclide were discussed and the correction factors were calculated. With the expertise from Guangdong Environmental Radiation Monitoring Center, a simplified method was presented, for routine measurement and emergency monitoring.

Measurement Capability Assessment of Gamma Nuclides in Aerosol in State Environmental Radiation Monitoring Network

Yao Haiyun, Lin Zhaofeng

RADIATION PROTECTION BULLETIN. 2014, 34(6): 32-36.

Abstract ( 19 )

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The results for gamma nuclides in aerosol in State Environmental Radiation Monitoring Network Measurement Assessment Program in 2013, held by the Environmental Radiation Monitoring Station of Zhejiang Province, were presented. With robust statistical method employed, it showed that 87.8% of measurement results were satisfied, 6.1% were dubitable, and remaining 6.1% dissatisfied. Comparison of the resulted median and the reference values indicated there may be a negative system error for the measurements of every nuclide. With this program, the measurement capability of gamma nuclides in aerosol in the network was generally understood, which provided a basis for the future quality assurance in the respect.

Monitoring for Compliance with Exemption and Clearance Levels —Introduction to IAEA Safety Reports Series No.67

Jiang Jing, Liu Zhihui, Zhu Zhaowen, He Wei, Li Xiaolong

RADIATION PROTECTION BULLETIN. 2014, 34(6): 37-41.

Abstract ( 23 )

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No.67 Safety Report of IAEA about monitoring technologies for compliance with exemption and clearance levels was introduced. It could help operating nuclear facilities to carry out systematic clearance activities for suspected radioactive wastes under the supervision of regulatory authorities.

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