著者

Keiko FUJIWARA Tomoyuki TAKAHASHI Tadatoshi KINOUCHI Satoshi FUKUTANI Yuki HATTORI Sentaro TAKAHASHI

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.50, no.3, pp.189-193, 2015 (Released:2016-02-06)

参考文献数

8

被引用文献数

1

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Various radionuclides, including radioactive tellurium (Te), were released to the environment by the Fukushima nuclear power plant accident. The total amount of Te-127m released from the power plant was estimated to be 1.1 × 1015 Bq. The radioactive Te may have contributed to the internal radiation dose at the initial stage of the accident. However, data on the environmental behavior of radioactive Te are limited. In this study, therefore, the uptake of Te in plants was investigated. Radishes (Raphanus sativus var. sativus) were cultivated into a nutrient solution, grown for 20-30 days, and then their fine roots (taproots in the plant anatomy) and a part of fleshy roots (hypocotyls in the plant anatomy) were immersed for two hours into nutrient solutions with different Te and Cs concentrations. After soaking, plants were returned to the initial Te- and Cs-free nutrient solution for further maturation. ICP-MS measurements were made to assess concentrations of Te and Cs in the plants' leaves and fleshy roots (the fine roots were removed). Resulting differences among the individual plants were large. The leaf/fleshy root ratios of the concentration of Te and Cs were 0.09-1.14 and 1.59-5.00 on a fresh-matter basis, respectively. Both Te and Cs were absorbed by the radishes through the fine roots. There was a general tendency for Te to be retained in the fleshy roots, whereas Cs was mainly absorbed by the fine roots and then transferred to the leaves.

著者

Yuki HATTORI Tadatoshi KINOUCHI Satoshi FUKUTANI Tomoyuki TAKAHASHI Keiko FUJIWARA Kayoko IWATA Sentaro TAKAHASHI

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.50, no.3, pp.194-196, 2015 (Released:2016-02-06)

参考文献数

11

被引用文献数

1

---

Three different types of soil were collected at each of three locations: a persimmon orchard, an ume (Prunus mume, so to speak, ‘a Japanese apricot’) orchard, and a paddy field located 50-55 km northwest from Fukushima Daiichi Nuclear Power Plant. The goal was to investigate the involvement of microbes inhabiting these soils on the behavior of 137Cs. The soils were sterilized with gamma ray irradiation for 30 hours (absorbed dose of 60 kGy) or with high-pressure steam (autoclave sterilization) at 121°C for 20 minutes. A radish cultivar (Raphanus sativus var. sativus) was then cultivated in those soils for 45 days, and the harvested taproots and leaves were testing using a Ge semiconductor detector for concentration of 137Cs. The result showed that the concentration of 137Cs in radishes cultivated in the sterilized soils with autoclave sterilization or gamma ray irradiation were significantly higher than in those cultivated in the unsterilized soils. An increase in the plant available 137Cs could be caused by NH4+ arisen from the multiple effects of the structural change of the soil, decomposition of organic matter, and/or extinction of the microbes by sterilization.

著者

Satoshi MIKAMI Shoji SATO Yoshifumi HOSHIDE Ryuichi SAKAMOTO Naotoshi OKUDA Kimiaki SAITO

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.50, no.3, pp.182-188, 2015 (Released:2016-02-06)

参考文献数

12

被引用文献数

13

---

Intercomparison of in situ gamma spectrometry was organized at a site contaminated by the radioactive fallout that originated from the Fukushima Dai-ichi Nuclear Power Plant accident. This intercomparison was conducted by eight teams from four different institutions, which have contributed to the government-led project to construct distribution maps of radionuclides deposited on the ground soil. The resultant 134Cs and 137Cs inventories evaluated by the participants agreed within 6% of the coefficient of variation, after correction for inhomogeneous distribution of the dose rate in air. The evaluated 40K inventories agreed within 4% of the coefficient of variation. The authors estimated that these results were in good agreement for creating distribution maps of the radionuclide inventory in the ground soil.

著者

石川 徹夫 床次 眞司 米原 英典 福津 久美子 山田 裕司

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.4, pp.329-338, 2001 (Released:2010-02-25)

参考文献数

21

被引用文献数

13 16 16

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To estimate dose from radon progeny, the effective dose per unit exposure to radon progeny (dose conversion factor, DCF) is needed. A dominant parameter related to DCF is the activity size distribution of radon progeny. In the present study, the DCF was calculated in the wide range of particle diameters (0.5-20nm [AMTD] and 20-5, 000nm [AMAD]), using a dosimetric approach. The calculations were based on a computer program, LUDEP, which implements an ICRP66 respiratory tract model. The calculated results showed that the DCF is sensitive to particle size distribution. The DCFs calculated for reference conditions in mines and homes were 13.7mSv WLM-1 and 14.3mSv WLM-1, respectively. These values were in good agreement with those reported in a few references. The DCF calculated in the present study is useful for the dose assessment of radon progeny in places that have different aerosol characteristics.

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

3

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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 “measurement, investigation and examination” 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 “anxiety” and “safe” were often used to convey the degree of health effects. Particularly in March of 2011, the concept of “danger” 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

小出 裕章

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.36-38, 2000 (Released:2010-02-25)

著者

鹿志村 芳範 安藤 秀樹

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.30, no.1, pp.19-26, 1995 (Released:2010-02-25)

参考文献数

5

被引用文献数

1 1

著者

安東 量子

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.2, pp.78-78, 2012 (Released:2012-12-07)

著者

藤元 憲三 宮崎 振一郎 酒井 一夫

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.147-151, 2005-06

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

5

---

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

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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

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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

田辺 裕

出版者

Japan Health Physics Society

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.28, no.4, pp.466-470, 1993

被引用文献数

1

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

反町 篤行 床次 眞司 Miroslaw JANIK 石川 徹夫 Sarata K. SAHOO 吉永 信治 米原 英典 酒井 一夫 山澤 弘実 秋葉 澄伯 古川 雅英 Quanfu SUN Yong-Jae KIM Supitcha CHANYOTHA Rakesh C. RAMOLA

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.45, no.1, pp.15-18, 2010 (Released:2011-02-04)

参考文献数

4

被引用文献数

1 1 1

著者

Hidehito NAKAMURA Yoshiyuki SHIRAKAWA Hisashi KITAMURA Nobuhiro SATO Sentaro TAKAHASHI

出版者

一般社団法人日本保健物理学会

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.49, no.2, pp.98-101, 2014 (Released:2015-05-21)

参考文献数

25

被引用文献数

7 9

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The enormous area of damage to Japan's Fukushima Daiichi nuclear power plant requires radiation detectors with robust base substrates to monitor high-dose-rate environmental radiation with long-term stability. Undoped aromatic ring polymers have considerable potential as base substrates in radiation detection. Here, we characterise polycarbonate (PC), which has excellent transparency, shock, radiation, and weather resistance, heat tolerance, and anti-abrasion qualities. It has a density of 1.20 g/cm3, an excitation maximum of 310 nm, and short-wavelength emission with a maximum at 350-nm. By taking into account its emission spectrum, we determined an effective refractive index of 1.64. PC has a light yield that is 0.67 times that of undoped poly (ethylene terephthalate). These results reveal that readily available PC is an effective base substrate for use in large-area radiation detectors for the nuclear power plant recovery process.

著者

南 賢太郎 福田 整司

出版者

Japan Health Physics Society

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.1, no.1, pp.20-30, 1966-09-30 (Released:2010-02-25)

参考文献数

17

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Contamination limits on the skin surface employed as a guide of the radiation protection for occupationally exposed individuals are derived by taking into account the external exposure dose to the skin and the internal exposure dose recieved by the inhalation, ingestion and skin penetration of the contaminants.The adequacy of the derived limits is discussed in relation to the detection probability of a hand-foot monitor for the hand contamination.The contamination limits for the skin, which have been adopted in other establishments, are also reviewed together with the general basis of the derivation.

著者

保田 浩志 賞雅 朝子 飯本 武志

出版者

一般社団法人日本保健物理学会

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.57, no.1, pp.30-35, 2022-03-31 (Released:2022-05-26)

参考文献数

3

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In addition to the International Commission on Radiological Protection (ICRP), there are several international organizations that are engaged in activities related to radiological protection. This article briefly reviews the aims and major activities of and interrelationships between those organizations, followed by opinions about how Japanese experts should contribute to those activities.

著者

長沢 忠明 上野 陽里 河合 廣

出版者

Japan Health Physics Society

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.16, no.3, pp.209-212, 1981 (Released:2010-02-25)

参考文献数

13

---

The transfer of tritium from a mouse injected with tritiated water to a mouse contact with the injected mouse was observed. Tritium transfered mainly through the air of small cage where both mice were haused. The kinetics of transfer to the tissues exposed to air, the skin and the lens, were similar to those to the tissues unexposed to air, the muscle and the testes. The absorbed doses of contact mice were 3-8% of injected mice for 125hr. The results showed that the contaminated individual was the source of contamination himself.

著者

上野 陽里 滝本 晃一

出版者

Japan Health Physics Society

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.23, no.4, pp.317-321, 1988 (Released:2010-02-25)

参考文献数

16

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The various changes occuring in sperm are often used to estimate the effects of toxic substances in the environment, for the reasons that sperm are the experimental materials concerning to the genetic effects and we can get them easily and repeatedly. As the environmental external ionizing radiation and radioactive elements in the environment are the factors to induce various effects on human body; it is likely to use sperm to estimate the effects of these factors on human body. The present experiment was carried out to evaluate whether the morphological or histochemical changes in sperm were of use to estimate the effects of radiation in the environment health physically, or not. X-rays and tritiated water were used in the present experiment. The observed effects in sperm were the reduction in sperm, morphological changes of sperm head, and the incidence of α-glycerolphophate dehydrogenase (α-GPD) deficient sperm. The results showed that the incidence of the α-GPD deficient sperm was the most suitable index to show the effects of ionizing radiation in three observed changes in sperm, because this change is hardly observed in the normal unirradiated mice and the incidence of α-GPD deficient sperm increased linearly till 1.5 Gy, that is, the relation was shown by the equation: y (%, incidence)=3.07×(Gy, dose).