著者

Tatsuya TSUBOI Hideki WADA Makoto YANAGA

出版者

日本放射線安全管理学会

雑誌

Radiation Safety Management (ISSN:13471511)

巻号頁・発行日

vol.11, no.1, pp.11-18, 2012 (Released:2012-12-21)

参考文献数

9

被引用文献数

3 4 1

---

Distribution of radioactive Cs was investigated in the surface soils of urban and vicinity areas of Shizuoka city, Japan. Concentration of 134Cs and 137Cs showed values in the range of 37 to 2435 Bq/m2 (1 to 95 Bq/kg) and 57 to 2242 Bq/m2 (2 to 98 Bq/kg), respectively. The original production ratio of 134Cs and 137Cs was estimated to be 1:1. The high activity areas were mainly observed along the Warashina area and southern slope of the Udo Hills. The pollutant fine particles with radioactive Cs released from the Fukushima Dai-ichi nuclear power plant were arrived at Shizuoka city by northwest wind in the morning and southwest wind in the afternoon on March 15, 2011. The radioactive Cs distribution pattern indicates that these pollutant particles were dropped on land surface of the Warashina area and southern slope of the Udo Hills during ascending wind in the afternoon on March 15, 2011.

著者

松原 純子

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.11, no.2, pp.160-169, 2012 (Released:2012-11-21)

参考文献数

41

著者

斉藤 卓也

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.3, no.1, pp.4-6, 2004 (Released:2011-03-17)

著者

杉浦 広幸

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.12, no.1, pp.67-70, 2013 (Released:2013-07-26)

参考文献数

8

著者

中島 覚

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.10, no.2, pp.191-191, 2011 (Released:2011-12-20)

著者

松田 尚樹

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.10, no.1, pp.64-67, 2011 (Released:2011-12-20)

参考文献数

16

被引用文献数

1

著者

河野 孝央

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.9, no.2, pp.133-140, 2010 (Released:2011-12-20)

参考文献数

17

被引用文献数

4

---

Potassic chemical fertilizers contain potassium, a small part of which is potassium-40. Since potassium-40 is a naturally occurring radioisotope, potassic chemical fertilizers are often used for demonstrations of the existence of natural radioisotopes and radiation. To fabricate radiation sources as educational tools, the compression and formation method developed by our previous study was applied to 13 brands of commercially available chemical fertilizers containing different amounts of potassium. The suitability (size, weight, and solidness) of thus fabricated sources was examined and 12 of them were selected as easy-to-use radiation sources at radiation educational courses. The radiation strength (radiation count rate measured by a GM survey meter) and potassium content of the 12 sources were examined. It was found that the count rate was wholly proportional to the percentage of potassium, and a new educational application was proposed and discussed for understanding that the substance emitting radiation must be the potassium present in the raw fertilizers.

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.13, no.2, pp.103-145, 2014 (Released:2014-11-21)

著者

中里 一久

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.11, no.2, pp.172-185, 2012 (Released:2012-11-21)

参考文献数

19

著者

Naoko Morita Miwa Miura Toshiro Usa Takashi Kudo Naoki Matsuda

出版者

日本放射線安全管理学会

雑誌

Radiation Safety Management (ISSN:13471511)

巻号頁・発行日

vol.12, no.2, pp.48-55, 2013 (Released:2013-12-19)

参考文献数

20

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The internal doses of 372 persons who were dispatched to the Fukushima prefecture at any time from April 2011 to March 2012 were examined using a whole body counter within 2 months after they left Fukushima. 131I was only detected in April while 134Cs and 137Cs were found up to November 2011. The maximum committed effective dose and thyroid equivalent dose were 22.4 μSv and 0.4 mSv, respectively, which were observed in April 2011 by the scenario of acute inhalation. The internal radioactivity was found in persons staying in almost all of the interior and the coastal regions regardless of the distance from the Fukushima-Daiichi nuclear power plant. Although there was no statistical significance, the detection rate of 134Cs and 137Cs appeared higher in subjects dispatched for relatively long-terms. Comparison of internal doses evaluated by the whole body counter and by prediction from environmental radioactivity indicates that the intake of radioactivity in March, April and possibly May 2011, would be mainly attributable to the inhalation of airborne radioactive particles, whereas in June and later months ingestion of contaminated food would be the major route of radioactive intake. These results suggest that the risk for internal exposure existed for approximately six months after the radiological accident in almost the entire area of Fukushima, however, adverse health consequences by the radiation dose due to internal exposure seem to be negligible. Furthermore, the present risk for internal exposure is quite low in the normal living situation.

著者

西澤 邦秀

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.8, no.1, pp.64-85, 2009 (Released:2011-11-30)

著者

Kazuo Kato Maya Ishihara

出版者

日本放射線安全管理学会

雑誌

Radiation Safety Management (ISSN:13471511)

巻号頁・発行日

vol.11, no.1, pp.4-10, 2012 (Released:2012-12-21)

参考文献数

11

被引用文献数

2 2 1

---

At a location in the central mountain area of the Chugoku region (Bihoku area), concentrations of 131I, 137Cs and 134Cs in rain and air dust were measured before and after the Tohoku-Pacific Ocean Earthquake that occurred on 11 March 2011. Rainwater was also sampled at a location near the Inland Sea. The rainwater was dried on a Naflon sheet. Airborne particles were collected using an air dust sampler. A pure Ge detector shielded by lead blocks was used to measure the gamma rays from the samples. In both locations of the Chugoku region, initial detections of 131I in rainwater occurred on 8 April 2011. On this date, the 131I concentrations in rainwater were 0.23 ± 0.03 Bq/kg in the mountain area and 0.19 ± 0.01 Bq/kg near the Inland Sea. The concentrations of radioactive cesium in rainwater were high from 19 April to 23 April 2011, and were 0.12 ± 0.02 Bq/kg of 134Cs and 0.12 ± 0.03 Bq/kg of 137Cs at maximum, respectively. The atmospheric concentration of 131I was 9 ± 2 mBq/m3 at maximum (6 April 2011), which was estimated without evaluating the 131I activities of the gaseous molecules that passed through an ordinary filter used in the air dust sampler. Maximum concentrations of 134Cs and 137Cs on 7 April 2011 were 10.2 ± 1.3 mBq/m3 and 9.7 ± 1.4 mBq/m3, respectively. Few radioactive cesium and iodine were observed in March. Western and northwestern winds in March probably prevented these artificial radioactive materials from the Fukushima Daiichi Nuclear Power Plant from reaching the mountain area of the Chugoku region.

著者

南戸 秀仁

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.8, no.1, pp.7-14, 2009 (Released:2011-11-30)

参考文献数

32

著者

宮本 由香 山本 幸佳

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.12, no.1, pp.19-20, 2013 (Released:2013-07-26)

著者

西澤 邦秀 伊藤 茂樹

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.10, no.2, pp.172-184, 2011 (Released:2011-12-20)

参考文献数

16

著者

秋吉 優史

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.16, no.2, pp.79-84, 2017 (Released:2017-11-09)

参考文献数

5

---

In the previous paper, the Peltier-cooling-type high performance cloud chamber was introduced, and the notes on the operation, the utilizing method and so on were described. In this paper, it is explained that the technical feature of the hardware which constitutes the Peltier-cooling-type high performance cloud chamber. This product is consisting of very many components that contain technical essence. These technical knowledge are released here so that it may be help for educator and researchers to manufacture the similar equipment or improve this device.

著者

西澤 邦秀 三好 弘一

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.10, no.1, pp.68-75, 2011 (Released:2011-12-20)

著者

Masahiro Hirota Shogo Higaki Takumi Higaki Seiichiro Hasezawa

出版者

日本放射線安全管理学会

雑誌

Radiation Safety Management (ISSN:13471511)

巻号頁・発行日

vol.12, no.2, pp.43-47, 2013 (Released:2013-12-19)

参考文献数

10

被引用文献数

2

---

The contamination of spinach collected immediately following the Fukushima Daiichi nuclear disaster was investigated. The radionuclides deposited in the spinach were 132Te, 131I, 132I, 134Cs, 136Cs and 137Cs. Only 40% of these radionuclides were removed when the spinach was washed with water or detergent. The two outside leaves of each spinach stump were contaminated with the radionuclides, but the three inside leaves were nearly uncontaminated. The most significant contamination was observed on the concavities, creases, veins and leaf or stem injuries of the spinach. Most of the radionuclides deposited on the surface, leading to a radioactivity concentration of the epidermal tissue 9 times that of the mesophyll tissue.

著者

田中 俊一

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.10, no.2, pp.116b-119, 2011 (Released:2011-12-20)

著者

丸山 茂徳

出版者

日本放射線安全管理学会

雑誌

日本放射線安全管理学会誌 (ISSN:13471503)

巻号頁・発行日

vol.8, no.2, pp.113-114, 2009 (Released:2011-12-07)