著者
木村 秀樹 高橋 秀昭 齋藤 稔
出版者
日本保健物理学会
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.43, no.1, pp.60-68, 2008 (Released:2010-08-05)
参考文献数
23

As part of the environmental radiation monitoring around the nuclear fuel cycle facilities constructed in Rokkasho-mura, we are carrying out continuous measurements of gross α and gross β radioactivities in air dust samples. Considering there measuring conditions, it is suggested that 210Po and 210Bi mainly contribute to gross α and gross β, respectively. The higher concentration of gross β radioactivity was observed during fall and winter. But then gross α radioactivity lowered during winter, and fluctuated on spring and fall. It is suggested that surface soils are one of major origins of gross α radioactivity, because 210Po/210Pb ratio in the soil is higher than the ratio in the air and the ground is covered with snow in winter. Large peaks of gross a radioactivity and α/β radioactivity ratio were observed on May 2003. Satellite imageries showed forest fires around Lake Baikal in this period. We confirmed that the air mass passed the vicinity of Lake Baikal and flowed in Rokkasho-mura by backward trajectories. There was a positive correlation between gross α radioactivity and the frequency of air mass traveling from the vicinity of Lake Baikal to Rokkasho-mura. The result suggested that the large peaks of the concentration of gross α radioactivity and α/β radioactivity ratio were caused by the forest fire in Russia.
著者
田中 裕史 迫田 晃弘 安藤 正樹 石森 有
出版者
日本保健物理学会
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.51, no.2, pp.107-114, 2016 (Released:2016-08-09)
参考文献数
9
被引用文献数
1

Ambient dose rates are continuously monitored in Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency. The present study discussed the variations in ambient dose rates, observed from April 2014 to March 2015, due to snowfall as well as rainfall. It is much snowy as one of climatic features in this area. Rain or snow was sampled for a certain period in the day of interest (17 cases in total), and then the concentration of radon progeny was measured. With the measured data, the variation in ambient dose rate was calculated considering the accumulation of the radon progeny on the ground. As a whole, this calculation was found to reasonably reproduce the time trends of observed dose rates, except for four cases. Based on the backward trajectory analysis, it was explained that the discrepancy in two cases out of the four was induced by changes of radon progeny concentration in precipitation around sampling period. It was suggested that the other two cases were caused by the run-off of rain from the ground surface.
著者
阿部 史朗
出版者
日本保健物理学会
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.17, no.2, pp.169-193, 1982 (Released:2010-02-25)
参考文献数
7
被引用文献数
9 5 34
著者
加藤 正平
出版者
日本保健物理学会
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.35, no.1, pp.96-98, 2000 (Released:2010-02-25)
被引用文献数
1
著者
水下 誠一
出版者
日本保健物理学会
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.35, no.1, pp.85-90, 2000 (Released:2010-02-25)
被引用文献数
1
著者
大橋 靖雄
出版者
Japan Health Physics Society
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.20, no.4, pp.357-369, 1985

In this paper, the possibility of the biological monitoring by <i>Tradescantia</i> for radiation effluents from a power reactor site is considered. Data for analysis were obtained through the experimental study which had been conducted by Expert Committee on Biological Effects of Environmental Radiation and carried out from 1979 to 1981 near to Takahama Nuclear Power Plant in Fukui Prefecture. Measurements had been taken on the mutation frequency in <i>Tradescantia</i> stamen hairs and environmental factors including evaluated radioactive airborne effluents, natural airborne radioactivity, weather conditions and air pollution indices. This paper is coupled with Yamaguchi <i>et al.</i> (1985); while the latter tackles the problem, mainly by comparing the observed (calculated) concentration levels of radioactive effluents with biological thresholds, this paper presents the results of statistical data analysis which revealed the following: (1) There is highly significant negative correlation between temperature before blooming and mutation frequency. (2) After adjusting the effect of temperature, there is no significant association between radioactive effluents and mutation frequency.
著者
神田 玲子 辻 さつき 米原 英典
出版者
日本保健物理学会
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.49, no.2, pp.68-78, 2014
被引用文献数
1

In general, the press is considered to have amplified the level of public's anxiety and perception of risk. In the present study, we analyzed newspaper article headlines and Internet contents that were released from March 11, 2011 to January 31, 2012 using text mining techniques. The aim is to reveal the particular characteristics of the information propagated regarding the Fukushima NPP Accident. The article headlines of the newspapers which had a largest circulation were chosen for analysis, and contents of Internet media were chosen based on the number of times they were linked or retweeted. According to our text mining analysis, newspapers frequently reported the &ldquo;measurement, investigation and examination&rdquo; of radiation/radioactive materials caused by the Fukushima Accident, and this information might be spread selectively via the social media. On the other hand, the words related to health effects of radiation exposure (i. e., cancer, hereditary effects) were rare in newspaper headlines. Instead, words like &ldquo;anxiety&rdquo; and &ldquo;safe&rdquo; were often used to convey the degree of health effects. Particularly in March of 2011, the concept of &ldquo;danger&rdquo; was used frequently in newspaper headlines. These indirect characterizations of the situation may have contributed more or less to the misunderstanding of the health effects and to the enhanced perception of risk felt by the public. In conclusion, there were found no evidence to suggest that newspapers or Internet media users released sensational information that increased the health anxiety of readers throughout the period of analysis.
著者
X. George XU
出版者
日本保健物理学会
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.41, no.3, pp.188-193, 2006 (Released:2010-08-05)
参考文献数
37
被引用文献数
1 1

We are at a critical time in the history of radiation protection dosimetry. The paradigm shift away from the more-than-30-years-old stylized human models is imminent with the development of 30 voxel-based tomographic models in recent years that are based on medical images. Recently, researchers gathered at an international conference to share the latest work and to establish collaborations. This invited review paper introduces various types of modelling and summarizes the latest developments including a Consortium on Computational Human Phantoms (CCHP) that is aimed at facilitating intercomparison and sharing of data for radiation protection purposes.