著者

佐藤 友樹

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.54, no.2, pp.137-139, 2019-06-17 (Released:2019-10-18)

著者

迫田 晃弘 辻 智也 廣田 誠子 渡邊 裕貴

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.57, no.2, pp.108-114, 2022-09-02 (Released:2022-10-19)

参考文献数

11

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 (Released:2015-05-21)

参考文献数

9

被引用文献数

5 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

反町 篤行 平尾 茂一 Mark ZHELEZNYAK 浅沼 順 脇山 義史 坂口 綾 恩田 裕一 難波 謙二

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.231-235, 2017 (Released:2017-11-15)

参考文献数

5

著者

古田 悦子

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.45, no.3, pp.253-261, 2010 (Released:2011-07-12)

参考文献数

15

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Recently many Japanese wear jewelry as personal ornaments, particularly bracelets. The jewelry is made of gems, jewels, noble metals and so on. Some kinds of jewelry include much amount of radioactive elements more than that of natural range in ores which are in our living-environment. The radioactive concentrations of 25 kinds of jewels and gems, which were easily purchased on a market or through the Internet, were analyzed by HPGe. The bracelet which was made of ceramics showed the highest radioactive concentration and it was estimated as approx. 800 Bq g-1 of 232Th and 140 Bq g-1 of 238U by assuming radioactive equilibrium among the nuclides in the decay series. Moreover, there was a high radioactive concentration gem including 60 Bq g-1 of 232Th and 300 Bq g-1 of 238U. The radioactive materials added in the ceramics should be monazite analyzed by a prompt gamma-ray activation analysis method. Though the ceramics became the object of the NORM management by the concentration, the radioactivity of one bracelet does not exceed 8,000 Bq. So, all these jewelry samples do not have to manage as NORM as consumer products according to the guideline by Japanese government. However, the jewelry's activity by deliberate addition of radioactive materials is deemed to be unjustified exposure, that the ICRP led the consideration. It is considered that the NORM guideline should take in the consideration of ICRP and prohibit the addition of radioactive materials to jewelry.

著者

神谷 研二

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.4, pp.167-168, 2014 (Released:2015-12-18)

被引用文献数

1

著者

明石 真言

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.54, no.3, pp.149-150, 2019-10-29 (Released:2019-11-21)

著者

山田 純也 橋本 周 瀬谷 夏美 羽場 梨沙 武藤 保信 清水 武彦 高崎 浩司 横山 須美 下 道國

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.1, pp.5-12, 2017 (Released:2017-04-22)

参考文献数

9

被引用文献数

2

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The purpose of this study is to improve a quick method for estimation of 131I concentrations in the air using data measured by monitoring posts in case that a nuclear disaster occurs. In this method, 131I concentrations were estimated by multiplying 131I count rates of cloud-shine measured with Na(Tl) detector by concentration conversion factor. A previous study suggested that it was difficult to determine passing-through time of plume from temporal change of 131I count rates or dose rate. Our study applies the method for estimating passing-through time of plume from temporal change of noble gas counts. The 131I concentrations in the air at Oarai center, Japan Atomic Energy Agency resulting from the accident at the Fukushima Daiichi Nuclear Power Station were estimated by proposal technique. The result of comparison of this method with sampling method for 131I concentrations in the air were within factor 3.

著者

床次 眞司 細田 正洋 岩岡 和輝 工藤 ひろみ

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.1, pp.11-19, 2015 (Released:2015-12-18)

参考文献数

24

被引用文献数

2 5

著者

鈴木 隆司 岡野 安宏 杉浦 城春 猪越 幸雄

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.33, no.2, pp.163-170, 1998 (Released:2010-02-25)

参考文献数

16

被引用文献数

1 2

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The concentrations of medically used radionuclides in activated sludge samples were measured for 10 waste water treatment plants (WWTP) in Tokyo from October 1983 to March 1994. The nuclides 99mTc, 67Ga, 111In 123I 131I and 201Tl, among others, could be detected, but these concentration levels were lower than the legal concentration limits in Japan. The excess activated sludge is usually incinerated at WWTP; then the resulting ash is transported for reclamation in Tokyo Bay. Internal and/or external exposure doses were evaluated for the following cases: (1) The dose of the public attributed to radioactive iodine and 201Tl, which were released from the incinerator by burning sludge; (2) The dose of the workers during the process of transport and reclamation of the ash. As a result, the effective doses were sufficiently lower than the dose limit 1mSv/y. The decay of the radionuclides were calculated over a period of curing of the landfill. It was found that the radionuclides had decayed out to approximately one nuclide. The effective dose of the public can therefore be ignored. Moreover, it was clarified that the effective dose of the public resulting from 99Tc is negligibly low in value at the present time.

著者

(社) 日本保健物理学会理事会

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.83-92, 2012 (Released:2012-12-07)

被引用文献数

1 1

著者

古田 定昭

出版者

日本保健物理学会

雑誌

保健物理 : hoken buturi (ISSN:03676110)

巻号頁・発行日

vol.41, no.1, pp.9-10, 2006-03-01

著者

古田 悦子 森田 裕子 吉沢 幸夫

出版者

日本保健物理学会

雑誌

保健物理 : hoken buturi (ISSN:03676110)

巻号頁・発行日

vol.42, no.4, pp.341-348, 2007-12

被引用文献数

1 2

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Internal exposure to alpha particles emitted from <222>^Rn (radon) and its daughters is the second leading cause of lung cancer. As a source of indoor radon in home, there are interior building materials that contain radioactive minerals. These radioactive consumer products have been claimed by distributors to have effect of "minus-ion" or "radon spring" for healthy promotion. We analyzed radioactive nuclides contained in the interior building materials, and measured radon levels released from them. The results of gamma-ray spectrometry revealed that these interior building materials contain U- and Th-series nuclides. The densities of some radioactive nuclides in the tile used for a bathroom exceeded the exempt limits of International Basic Safety Standards. However, the radon densities released from the tile was lower than detectable limit. In contrast, one of the wallpaper released 34Bq・m^<-3> of radon gas in a 50-liter container. This value is two times higher than the average radon level in Japanese homes. The "minus-ion effect" wallpapers are thought to be a cause of residential exposure to radon.

著者

嶋田 和真

出版者

日本保健物理学会

雑誌

保健物理 : hoken buturi (ISSN:03676110)

巻号頁・発行日

vol.42, no.2, pp.135-136, 2007-06

著者

楢崎 幸範 加留部 善晴

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.2, pp.123-129, 2001 (Released:2010-02-25)

参考文献数

30

著者

上蓑 義朋

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.54, no.4, pp.203-204, 2019-12-27 (Released:2020-01-31)

被引用文献数

1

著者

Augustin JANSSENS

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.1, pp.5-6, 2014 (Released:2015-02-26)

参考文献数

8

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.2, pp.77-87, 2017 (Released:2017-07-29)

参考文献数

37

被引用文献数

4

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In April 2011, the International Commission on Radiological Protection recommended reducing the occupational equivalent dose limit for the lens of the eye. Since then, discussions toward implementation of such a revised dose limit into national law have been made in various countries. In the United States of America (US), the National Council on Radiation Protection and Measurements (NCRP) established Scientific Committee 1-23 (SC 1-23) in January 2014 to provide guidance on whether existing dose limits for the ocular lens should be changed in the US, to which the author of this paper served as Consultant. In January 2017, NCRP published Commentary No. 26 “Guidance on radiation dose limits for the lens of the eye” which was prepared by SC 1-23. With this Commentary, NCRP now recommends reducing the occupational dose limit for the lens from equivalent dose of 150 mSv/year to absorbed dose of 50 mGy/year along with the use of relative biological effectiveness value for high linear energy transfer radiation. This review provides an outline of this Commentary.

著者

高畠 賢 砂押 正章 金 小海 森岡 孝満

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.53, no.1, pp.28-34, 2018 (Released:2018-06-05)

参考文献数

49

著者

野口 宏 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.20, no.1, pp.49-59, 1985 (Released:2010-02-25)

参考文献数

54

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The literature on conversion of tritium gas to tritiated water in various environments is reviewed. The conversion mechanisms and the conversion rates are as follows.1. In the oxidation with oxygen and the isotopic exchange with water, tritium β-rays and metal catalyst are effective. The oxidation rate is -0.02%/day at initial tritium concentration ≤10-2Ci/l and -2%/day at 1Ci/l. In the presence of oxygen and water, it is not clear whether the exchange reaction occurs or not because of the small amount of data.2. For biological conversion, soil microorganisms contribute significantly. The conversion rate is greater than 10%/hr. The tritium gas deposition velocity, which includes the uptake rate of tritium gas by soil and the conversion. rate, ranges from 0.0025 to 0.11cm/sec and is influenced by temperature and moisture of the soil.3. Tritium gas is converted to the tritiated water througn the reaction with hydroxyl radical produced by sunlight in the atmosphere.