Screening for 137Cs Body Burden Due to the Chernobyl Accident in Korosten City, Zhitomir, Ukraine: 1996-2008
Screening for 137Cs Body Burden Due to the Chernobyl Accident in Korosten City, Zhitomir, Ukraine: 1996-2008
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DOI：
10.1269/jrr.11017
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发表时间：
2011-09-01
影响因子：
2
通讯作者：
Takamura, Noboru
中科院分区：
文献类型：
--
作者：
Hayashida, Naomi;Sekitani, Yui;Takamura, Noboru
1986年4月26日切尔诺贝利核电站(CNPP)事故期间，大量放射性核素被释放并扩散到大片地区。由于Cs-137的半衰期很长(30年)，居住在核电厂周围的居民受到了外部和内部照射。在这项研究中，我们使用全身计数器对乌克兰日托米尔州的体内Cs-137浓度进行了筛查。参与者总数为144,972人(96,149名女性和48,823名男性)。从1996年到2008年，每体重Cs-137的身体负担中位数有所下降。特别是，2003年后，超过一半的受试者体内照射剂量低于可检测到的水平。在1997至1999年的量度数据中发现有微弱的季节性效应，但随后几年没有观察到这种影响。我们还计算了每年的年剂量，并确认剂量一直在逐渐减少。特别是，2003年后，95%的参与者的年有效剂量降至0.1mSv(-1)。自2007年以来，只有两人被发现接受了超过5 mSv y(-1)的治疗。尽管切尔诺贝利事故造成的Cs-137身体负担对健康的影响尚不确定，但需要进一步进行筛查，以监测核电站周围受污染地区居民的健康状况，缓解居民的焦虑。
During the Chernobyl Nuclear Power Plant (CNPP) accident on 26 April 1986, large amounts of radionuclides were released and spread to vast areas. Inhabitants residing around CNPP have been exposed to external and internal irradiation due to the long half-life of Cs-137 (30 years). In this study, we screened for internal whole-body Cs-137 concentration using a whole-body counter in the Zhitomir state of Ukraine. The total number of participants was 144,972 (96,149 females and 48,823 males). The median body burden of Cs-137 per body weight decreased from 1996 to 2008. In particular, after 2003, more than half of subjects had internal exposure doses below the detectable level. A weak seasonal effect was found in measurement data from 1997 to 1999, but no such effects were observed in later years. We also calculated annual dose for each year and confirmed that doses have been decreasing gradually. In particular, after 2003, the annual effective dose decreased to 0.1 mSv y(-1) for 95% of the participants. Only two persons were found to have received more than 5 mSv y(-1) since 2007. Although the health effects of Cs-137 body burden due to the Chernobyl accident remain uncertain, further screening is needed to monitor the health status and to allay the anxiety of inhabitants in the contaminated areas around CNPP.