著者
Shymal Ranjan CHAKRABORTY Abdus Sattar MOLLAH Aleya BEGUM Gias Uddin AHMAD
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.40, no.2, pp.191-201, 2005 (Released:2010-08-05)
参考文献数
21
被引用文献数
1

The activity concentration levels of 232Th, 238U, 40K and 137Cs in drinking water of different locations of Bangladesh were measured by using a high purity germanium (HPGe) detector. The average activity levels with one standard deviation (1σ) of 232Th, 238U and 40K were found to be 250±52mBq/L-1, 157±30mBq/L-1 and 9±3Bq/L-1, respectively. The 137Cs was detected only in 32% samples with an average 4±0.8Bq/L-1. A good correlation between the activities of 232Th and 238U was found. The radium equivalent activity (Raeq) and the representative level index (Iγr) due to natural radionuclides were also calculated. The average Raeq was found to be 1, 212±303mBq/L-1 and the average Iγr was found to be 10±3mBq/L-1. The annual individual committed effective dose (HE) due to intake of radionuclides in water was also evaluated and the average value was found to be 74±21μSv. The distribution of radionuclides was found to be normal except 137Cs. The radioactivity levels of these radionuclides were comparable to the corresponding reported values of drinking water of different countries. The results presented in this study may helpful in establishing a regulatory limit on radioactivity in drinking water in Bangladesh.
著者
木村 仁宣 本間 俊充
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.2, pp.76-87, 2006 (Released:2010-08-05)
参考文献数
38
被引用文献数
1

In the event of a nuclear or radiological emergency, short-term countermeasures are implemented. This report summarizes the current status of these countermeasures, such as sheltering, evacuation and iodine prophylaxis in OECD/NEA member countries.
著者
古川 雅英 床次 眞司
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.36, no.3, pp.195-206, 2001 (Released:2010-02-25)
参考文献数
39
被引用文献数
4 8

The absorbed dose rate in air because of terrestrial gamma radiation in Miyako-jima, an island that is part of Okinawa Prefecture in the subtropical region of Japan, was estimated at 637 points by in situ measurements with spectrometers equipped with 3″φ×3″NaI (Tl) and 1″φ×2″NaI (Tl) scintillation detectors. The mean, minimum, and maximum dose rates were calculated to be about 79nGy/h, 3nGy/h, and 165nGy/h, respectively. The correlation of the dose rate and geology showed that the high-rate areas (>100nGy/h) and the distribution of the Holocene red soils (Onokoshi Clay) overlap each other. On the other hand, the low dose rates (<30nGy/h) were mainly found in an outcrop of the Pleistocene Ryukyu Limestone, the main geologic element in the foundation of the red soils. Recent studies (e. g., Inoue et al., 1993) concluded that most of the red soils were not residuals from the base rocks, but of eolian dust “Kosa (Yellow Sand)” origin. These results strongly indicate that the dose rate in Miyako-jima has been enhanced as a result of eolian deposits transported mainly from the arid region of China since the last glacial epoch.
著者
田ノ岡 宏
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.32, no.1, pp.9-12, 1997 (Released:2010-02-25)
参考文献数
20
著者
浜田 信行
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.52, no.3, pp.159-166, 2017 (Released:2017-11-15)
参考文献数
27
被引用文献数
1

In its latest basic recommendations issued in 2007, the International Commission on Radiological Protection (ICRP) recommends that the working conditions of a pregnant worker, after declaration of pregnancy, be such as to ensure that the additional dose to the embryo and fetus would not exceed about 1 mSv during the remainder of the pregnancy, where exposures of the embryo and fetus of pregnant workers are considered and regulated as public exposures. However, it remains unclear, e.g., [1] whether such recommended additional dose of about 1 mSv to the embryo and fetus is the whole body equivalent dose or the effective dose, [2] if the latter, how to compute the effective dose while the currently recommended tissue weighting factors (wT) do not include the stochastic risks of in utero exposures and while the unavailability of the current epidemiological data sets does not allow computation of detriment for in utero exposures, and [3] whether the embryo and fetus are the public. This paper briefly reviews historical changes in ICRP recommendations on protection of pregnant workers, embryo and fetus, and then discusses pertinent issues behind the 2007 recommendations.
著者
永井 晴康
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.47, no.1, pp.13-16, 2012 (Released:2012-09-06)
参考文献数
13
被引用文献数
1 1
著者
山本 政儀
出版者
Japan Health Physics Society
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.24, no.3, pp.249-257, 1989 (Released:2010-02-25)
参考文献数
11

The accident at the Chernobyl reactor site starting at 26th April 1986 caused a widespread distribution of radionuclides. In all countries radiation measurements and analyses of samples have been made to show the features to consider in a dosimetric evalution, but transuranium elements have been less investigated.In Europe, the determination of several transuranium elements, such as neptunium (Np-239), plutonium (Pu-238, 239, 240, 241), americium (Am-241) and curium (Cm-242) was possible. The total depositions (mBq/m2) at Monaca, Rise (Denmark) and Neuherberg (Munich) were estimated to be 10, 20 and 51, respectively. These levels are only 0.01-0.05% of the previous deposition from nuclear weapons tests. The activity ratios Pu-238/Pu-239, 240 (0.4-0.5) and Pu-241/Pu-239, 240 (80-90) from Chernobyl fallout were much higher than those from nuclear weapons tests. Here, a more detailed feature of transuranium elements released into environment from the Chernobyl reactor is presented comparing with that from nuclear weapons fallout, including the measurements of transuranium elements of the Chernobyl debris in Japan.
著者
角川 正義 井上 義教
出版者
Japan Health Physics Society
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.2, no.2, pp.81-94, 1967-06-30 (Released:2010-02-25)
参考文献数
76

The causes of fires of plutonium and uranium in the nuclear facilities are summalized through the literature survey of accidents in the United States and the United Kingdom, and of metallurgical studies. It is noticeable that spontaneous ignition is due to the operations such as of degreasing, leaching, cutting and scraping, to the treatment with nitric acid, or to the existence of moisture, for example, after low-temperature experiment of the metals.The methods of fire-prevention and fire-fighting at the plutonium fires are also described with the recommendation on the view point of health physics: Aluminum icontaner is likely to have excellent property for the fire prevention. The data of particle size distribution and deposition velocity of plutonium emitted at the fire are also showed. Finally, the efficient agent and technique of fire extinguishing are described with some data from experiences in the accidents and the laboratory experiments.
著者
Ching-Chung HUANG Pei-Huo LIN Yu-Ming LIN Pao-Shan WENG
出版者
Japan Health Physics Society
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.21, no.4, pp.265-271, 1986 (Released:2010-02-25)
参考文献数
18

This paper deals with the X-radiation from television receivers and video display terminals. The bremsstrahlung production rate was calculated according to the thick target theory, and the transmitted X-radiation was measured by the spectrometry method. The calculated and the measured results were compared and discussed. In addition, evidences were shown that only the highest energy component of the bremsstrahlung can penetrate the cathode ray tube.
著者
相本 篤子
出版者
Japan Health Physics Society
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.32, no.2, pp.139-143, 1997 (Released:2010-02-25)
参考文献数
10
著者
雨宮 好文
出版者
Japan Health Physics Society
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.32, no.2, pp.135-138, 1997 (Released:2010-02-25)
参考文献数
2
著者
山田 裕司 宮本 勝宏 森 貞次 小泉 彰
出版者
Japan Health Physics Society
雑誌
保健物理 (ISSN:03676110)
巻号頁・発行日
vol.17, no.4, pp.461-467, 1982 (Released:2010-02-25)
参考文献数
11

Collection performance of a HEPA filter and a new type filter which was recently developed for removing fine particles below 0.3μm was verified by using a laser aerosol particle counter in the particle size range from 0.12 to 0.42μm diameter in which the filter performance was not sufficiently clarified. Tested filter sheets were 14.5cm by 14.5cm in dimensions.DOP particles ranging from 0.12 to 0.17μm exhibited higher penetration of HEPA filter than DOP particles from 0.27 to 0.42μm by a factor of 20 at the standard face velocity of 2.4cm/sec. The penetration of HEPA filter was 6.6×10-4 for 0.12 to 0.17μm DOP particles, and that of the new type filter was 3.1×10-6.It was confirmed that overall system penetration of two HEPA filters in series could be described as the product of each stage penetration.