Dose assessment for airborne radionuclides emitted from Sakurajima volcano and discussion for lung cancer risk (case-control study)

樱岛火山空气中放射性核素的剂量评估及肺癌风险讨论（病例对照研究）

基本信息

批准号：
13470083
负责人：
AKIBA Suminori
金额：
$ 2.88万
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2004
项目状态：
已结题

项目摘要

1.We examined lung cancer mortality in 11 cities in Kagoshima Prefecture. Among those cities, Tarimizu showed the highest lung cancer mortality among women. Tarumizu City had extremely high amount of ashfall from Sakurajima volcano in the 1980s.2.We measured outdoor concentrations of radon and its progeny in Kagoshima City, Kirishima Town, and Tarumizu City located in the vicinities of Mt Sakurajima and Kirishima. Their average concentration was 3 Bq/m^3 in Kagoshima, and 5 Bq/m^3 in Kirishima ; their levels were not much different from the national average level of 5 Bq/m^3. On the other hand, Tarumizu recorded the concentration as high as 50 Bq/m^3 frequently. By obtaining meteorological data, the effects of meteorological parameters on the concentration of radon and its progeny was analyzed. The analysis showed that the concentration of radon and its progeny was related to the amount of ashfall but was not associated with sulfur dioxide concentration or the levels of suspended particulate matters.3.We measured the indoor concentration of radon and its progeny in the houses inhabited by healthy controls. The concentration was 14.5 Bq/m^3 in Kagoshima, 14.5 Bq/m^3 in Kirishima, and 11 on average (ranging 5-25) in Tarumizu. Those leves were not significantly different from the national average levels of 15.5 Bq/m^3.4.We interviewed patients with lung cancer or chronic respiratory diseases and measured the levels of radon and its progeny in the houses inhabited by those patients. The average concentration was 10.8 Bq/m^3 and was not significantly different from the levels recorded in the houses of healthy controls. However, there were two houses where the radon concentration was as high as 43 Bq/m^3 and 90 Bq/m^3. The radiation levels correspond to about 10-20 mSv/year, which is much higher than the dose limit of 1 mSv/year for the general public recommended by the ICRP.

1.我们调查了鹿儿岛县11个城市的肺癌死亡率。在这些城市中，塔水水的女性肺癌死亡率最高。垂水市在 20 世纪 80 年代曾有大量樱岛火山喷出的火山灰。2. 我们测量了鹿儿岛市、雾岛町以及位于樱岛山和雾岛附近的垂水市的氡气及其子体的室外浓度。鹿儿岛的平均浓度为3 Bq/m^3，雾岛的平均浓度为5 Bq/m^3；其水平与全国平均水平 5 Bq/m^3 相差不大。另一方面，垂水经常记录到高达 50 Bq/m^3 的浓度。通过获取气象数据，分析气象参数对氡及其子体浓度的影响。分析表明，氡气及其子体浓度与降灰量有关，而与二氧化硫浓度、悬浮颗粒物浓度无关。3、对居住房屋室内氡气及其子体浓度进行了测量。通过健康的控制。鹿儿岛的浓度为14.5 Bq/m^3，雾岛的浓度为14.5 Bq/m^3，垂水的浓度平均为11（范围为5-25）。这些水平与全国平均水平15.5 Bq/m^3.4没有显着差异。我们采访了肺癌或慢性呼吸道疾病患者，并测量了这些患者居住房屋中的氡气及其子体的水平。平均浓度为 10.8 Bq/m^3，与健康对照鸡舍中记录的水平没有显着差异。然而，有两间房屋的氡气浓度分别高达43 Bq/m^3和90 Bq/m^3。辐射水平相当于每年约10-20毫西弗，远高于ICRP建议的公众每年1毫西弗的剂量限值。