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7. Environmental Radiation Status In and Around Tokyo Immediately After the TEPCO Fukushima Dai-ichi Nuclear Power Plant Disaster

Author

Iimoto, Takeshi, primary, Fujii, Hirofumi, additional, Someya, Seiichi, additional, Iiizumi, Sadao, additional, Ebisawa, Takao, additional, Hirose, Seiichi, additional, Furuta, Etsuko, additional, Kusama, Keiji, additional, Nogawa, Norio, additional, Mitani, Hiroshi, additional, Kamiko, Masao, additional, Kutsuna, Natsumaro, additional, Watanabe, Yasuhiro, additional, and Suzuki, Takahiko, additional

Published
2013
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9. Elevated rice 137Cs concentrations near the water inlet in paddy fields after the Fukushima nuclear accident.

Author

Suzuki, Yoshimasa, Shoji, Ryosuke, Tsurumaki, Takahiro, Tamaki, Syohei, Nakashima, Kousei, Miyazu, Susumu, Yoshikawa, Natsuki, Ishii, Hideki, Nogawa, Norio, Nonaka, Masanori, Suzuki, Kazuki, and Harada, Naoki

Subjects
CESIUM isotopes, FUKUSHIMA Nuclear Accident, Fukushima, Japan, 2011, BROWN rice, RICE, NUCLEAR power plant accidents, INLETS, PADDY fields, RICE straw
Abstract

The reasons why rice 137Cs concentrations increase near the water inlet were investigated using rectangular experimental plots settled in paddy fields. The 137Cs concentrations in brown rice and rice straw were highest at 1 m from the inlet and decreased gradually with increasing distance, showing a negative correlation with soil exchangeable potassium content (Ex-K). The 137Cs concentration in brown rice was negatively and positively correlated with yield and sterility rate, respectively. These results suggest that soil Ex-K reduction and rice anomalies occurred near the water inlet and could contribute to the local elevation of 137Cs concentrations in rice. [ABSTRACT FROM AUTHOR]

Published
2022
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10. Comparison of Concentration Methods for Low-level Radiocesium in Fresh Water

Author

YASUTAKA, Tetsuo, SHIN, Moono, ONDA, Yuichi, SHINANO, Takuro, HAYASHI, Seiji, TSUKADA, Hirofumi, AONO, Tatsuo, IIJIMA, Kazuki, EGUCHI, Sadao, OHNO, Koichi, YOSHIDA, Yukihiro, KAMIHIGASHI, Hiroshi, KITAMURA, Kiyoshi, KUBOTA, Tomijiro, NOGAWA, Norio, YOSHIKAWA, Natsuki, YAMAGUCHI, Hiroaki, SUEKI, Keisuke, TSUJI, Hideki, MIYAZU, Susumu, OKADA, Yukiko, KURIHARA, Momo, TARJAN, Sandor, MATSUNAMI, Hisaya, and UCHIDA, Shigeo

Abstract

A large amount of radiocesium was released from the accident at Fukushima Daiichi Nuclear Power Plant of Tokyo Electric Power Company. The determination of dissolved and particulate radiocesium concentrations in water is important, which can be used as basic information for understanding the long-term radiocesium dynamics in the environment and the transfer of radiocesium to crops. Conventional quantitative methods include the evaporative concentration to the dryness method and the AMP method. These methods need to concentrate about 20–200 L of water due to the low concentration of the dissolved radiocesium. After the accident, several new methods, such as the Prussian blue filter cartridge method and the solid-phase disk method, have been developed and put to practical use. In this study, we carried out an accuracy evaluation test to assess five methods (i.e., the evaporative concentration to dryness method, the AMP method, the Prussian blue filter cartridge method, the solid-phase disk method, and the ion-change resin method) using 3 types of water samples containing 0.01-1.0 Bq L−1 of dissolved radiocesium. Our results showed that the z-scores of over 80 % of the measured data were within ±2 and their CVs in the range of 8-13 %, indicating good reproducibility of these methods.

Published
2017

12. Yearly Changes in Rice and Soil Radiocaesium Concentrations in Minamisoma City, Fukushima Prefecture, Japan—Monitoring Results from 2013 to 2016—

Author

Suzuki, Yoshimasa, primary, Shoji, Ryousuke, additional, Tsurumaki, Takahiro, additional, Matsubara, Tatsuya, additional, Tamaki, Syouhei, additional, Nakajima, Kousei, additional, Tsuruta, Ryousuke, additional, Yoshikawa, Natsuki, additional, Ishii, Hideki, additional, Nogawa, Norio, additional, Nonaka, Masanori, additional, and Harada, Naoki, additional

Published
2019
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19. Radioactive Morganite

Author

Kitawaki, Hiroshi, primary, Horikawa, Yoichi, additional, Shozugawa, Katsumi, additional, and Nogawa, Norio, additional

Published
2012
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21. The Radioactivity Measurement of Milk from the Cow Supplied with the Meadow Grass Grown in Ibaraki-prefecture, after the Nuclear Power Plant Accident

Author

HASHIMOTO, Ken, primary, TANOI, Keitaro, additional, SAKURAI, Kenta, additional, IIMOTO, Takeshi, additional, NOGAWA, Norio, additional, HIGAKI, Shogo, additional, KOSAKA, Naoki, additional, TAKAHASHI, Tomotsugu, additional, ENOMOTO, Yuriko, additional, ONOYAMA, Ichiro, additional, LI, Jun You, additional, MANABE, Noboru, additional, and NAKANISHI, Tomoko M., additional

Published
2011
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29. A Method to Estimate the Fast-Neutron Fluence for the Hiroshima Atomic Bomb

Author

Shibata, Tokushi, primary, Imamura, Mineo, additional, Shibata, Seiichi, additional, Uwamino, Yoshitomo, additional, Ohkubo, Tohru, additional, Satoh, Shinngo, additional, Nogawa, Norio, additional, Hasai, Hiromi, additional, Shizuma, Kiyoshi, additional, Iwatani, Kazuo, additional, Hoshi, Masaharu, additional, and Oka, Takamitsu, additional

Published
1994
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37. Tritation of benzoic acid by <SUP>6</SUP>Li(n,α)<SUP>3</SUP>H reaction with enriched lithium-6

Author

Oohashi, Kunio, Nogawa, Norio, Makide, Yoshihiro, Morikawa, Naotake, and Izumo, Misiroku

Abstract

Lithium benzoate containing 95 atom% lithium-6 (abbreviation: enriched) was tritiated by neutron irradiation in a pile. The degree of tritium incorporation to the benzene ring was 6.9 to 7.6 times that for the benzoate of natural isotopic abundance (abbreviation: natural abundance) according to the sample size, i.e., the geometries of irradiation samples were compared under the same thermal neutron fluence. The computed self-shielding effect for incident neutrons was negligible in the irradiation of the latter benzoate, while in the case of the former one rather large effects were observed in thick samples used in the present experiment. The tritium distribution in the benzene ring showed a slight ortho orientation in the irradiation of enriched 6Li compound, but was almost uniform in the other compounds. Copyright © 1998 John Wiley & Sons, Ltd.

Published
1998
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38. A Method for Preparing A Large Sized, Uniform and Stable Built-up Film of 109Cd Icosanoate as A Radioactive Source by Utilization of an Extremely Small Amount of Substrate Solution

Author

Iwahashi, Makio, Naito, Fujio, Watanabe, Norifumi, Seimiya, Tsutomu, Morikawa, Naotake, Nogawa, Norio, Ohshima, Takayoshi, Kawakami, Hirokane, Ukai, Kumataro, Sugai, Isao, Shibata, Seiichi, Yasuda, Takahiro, Shoji, Yoshihiko, Suzuki, Takeshi, Nagafuchi, Teruyasu, Taketani, Hiroshi, Matsuda, Takeshi, Fukushima, Yasutaka, Fujioka, Manabu, and Hisatake, Kazuo

Abstract

A stable radioactive source in vacuowas obtained by a modified horizontal lifting method of Langmuir-Blodgett (L/B) film. In spite of the slight consumption of the substrate solution (only 2–2.5 ml) for preparing a 15 mm×25 mm sized L/B film containing four molecular layers of 109Cd icosanoate, the deposition of the film was complete. The reliability of the deposited films by this method was confirmed by their radioactivities, deposition ratios and autoradiographs. The condition to obtain a larger sized homogeneous L/B film (20–25 mm×102 mm) was also examined. Two or four molecular layers of nonradioactive Cd icosanote deposited on the L/B film of 109Cd icosanoate did not influence the intensity of the γ-ray of 88.0 KeV. Concequently, it is possible to obtain the high radioactive source by the deposition of the multilayers of 109Cd icosanoate. Spectra of L2and L3conversion electrons from the 109Cd in its built-up film were also determined. In conclusion, the present depositing method for the L/B film is excellent for the manufacturing the radioactive source and thought to be also applicable for the deposition of other valuable materials.

Published
1985
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40. This title is unavailable for guests, please login to see more information.

Author

Suzuki, Hiroyuki, Ogiyama, Shinichi, Kumagai, Hiroshi, Nogawa, Norio, Ushio, Shingo, Anzai, Tetsuo, Sakamoto, Kazunori, Inubushi, Kazuyuki, Suzuki, Hiroyuki, Ogiyama, Shinichi, Kumagai, Hiroshi, Nogawa, Norio, Ushio, Shingo, Anzai, Tetsuo, Sakamoto, Kazunori, and Inubushi, Kazuyuki

Abstract

We examined the absorption of Zn, Cr and Mn into Brassica campestris L. cultivated in Brown Lowland soil (BL soil), Andosol and Brown Forest soil (BF soil) after five years' applications of chemical fertilizer (CHF), cattle farmyard manure (CFM) and pig farmyard manure (PFM). The effects of animal manure applications on the absorption of Zn, Cr and Mn by B. campestris were estimated by comparing the result in the CFM- and PFM-applied plots with that in CHF-applied plot. Zinc, Cr and Mn in B. campestris were measured by the instrumental neutron activation analysis (INAA) to perform total simultaneous analysis at a high sensitivity. The results obtained in this study were summarized as follows: 1) For Zn and Cr in B. campestris, the results obtained from INAA were compared with a nitric acid-digestion method (NADM). Results obtained from the INAA and NADM were fully in agreement for Zn, but not in agreement for Cr. The Cr concentration in B. campestris determined using NADM was only 13-2727777671520f that determined by INAA. From the results above, it is suggested that INAA could be used to analyze the correct amounts of trace elements removed by B. campestris. 2) CFM application increased Cr concentration in B. campestris cultivated in BL soil and Zn concentration cultivated in BF soil, while decreased Cr and Mn concentrations cultivated in Andsol and Cr and Mn cultivated in BF soil. PFM application led to a significant increase on the Zn concentration in B. campestris cultivated in BL soil, Zn and Mn cultivated in Andsol and Zn, Cr and Mn cultivated in BF soil. In BL soil, PFM application tended to decrease the Cr concentration in B. campestris. For Zn, Cr and Mn in CFM-applied plot of BF soil, Cr and Mn in CFM-applied plot of Andsol and Cr in CFM- and PFM-applied plots of BL soil, the change of availability by B. campestris of Zn, Cr and Mn in animal manure may provide an important influence on the uptakes of these elements by B. campestris., 3) For Zn, Cr and Mn, the removed amounts by cropping were smaller than their amounts added by the animal manure. Since the 5-year application of animal manure did not result in a considerable increase in Cr and Mn concentrations in soils, we have to continue soil survey to collect data on the soil accumulation of Cr and Mn contained in animal manure.

41. Electron Energy Loss Spectrum in Adsorbed Residual Gas on Cooled Arachidic Acid Langmuir-Blodgett Film and Its Adsorbed Gas Amount

Author

Kawakami, Hirokane, primary, Nisimura, Keigo, additional, Ohshima, Takayoshi, additional, Shibata, Seiichi, additional, Shoji, Yoshihiko, additional, Sugai, Isao, additional, Ukai, Kumataro, additional, Yasuda, Takahiro, additional, Morikawa, Naotake, additional, Nogawa, Norio, additional, Nagafuchi, Teruyasu, additional, Naito, Fujio, additional, Suzuki, Takeshi, additional, Taketani, Hiroshi, additional, Iwahashi, Makio, additional, Hisatake, Kazuo, additional, Fujioka, Manabu, additional, Fukushima, Yasutaka, additional, Matsuda, Takeshi, additional, and Taniguchi, Takashi, additional

Published
1989
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42. A thin, uniform, and nonvolatile tritium source for the measurement of electron antineutrino mass by means of the Langmuir—Blodgett technique

Author

Iwahashi, Makio, primary, Yasuda, Takahiro, additional, Shoji, Yoshihiko, additional, Ohshima, Takayoshi, additional, Kawakami, Hirokane, additional, Shibata, Seiichi, additional, Ukai, Kumataro, additional, Sugai, Isao, additional, Nishimura, Keigo, additional, Naito, Fujio, additional, Suzuki, Takeshi, additional, Nagafuchi, Teruyasu, additional, Taketani, Hiroshi, additional, Morikawa, Naotake, additional, Nogawa, Norio, additional, Matsuda, Takeshi, additional, Fukushima, Yasutake, additional, Taniguchi, Takashi, additional, Fujioka, Manabu, additional, and Hisatake, Kazuo, additional

Published
1988
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46. Preparation of Low-Energy Reference Electron Source with 169Yb

Author

Kawakami, Hirokane, primary, Nisimura, Keigo, additional, Ohshima, Takayoshi, additional, Shibata, Seiichi, additional, Shoji, Yoshihiko, additional, Sugai, Isao, additional, Ukai, Kumataro, additional, Yasuda, Takahiro, additional, Morikawa, Naotake, additional, Nogawa, Norio, additional, Nagafuchi, Teruyasu, additional, Naito, Fujio, additional, Suzuki, Takeshi, additional, Taketani, Hiroshi, additional, Iwahashi, Makio, additional, Hisatake, Kazuo, additional, Fujioka, Manabu, additional, Fukushima, Yasutaka, additional, Matsuda, Takeshi, additional, and Taniguchi, Takashi, additional

Published
1988
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47. Neutrino Mass and End-Point Energy of3H β-Decay

Author

Kawakami, Hirokane, primary, Kato, Sadayuki, additional, Naito, Fujio, additional, Nisimura, Keigo, additional, Ohshima, Takayoshi, additional, Shibata, Seiichi, additional, Suzuki, Takeshi, additional, Ukai, Kumataro, additional, Morikawa, Naotake, additional, Nogawa, Norio, additional, Nagafuchi, Teruyasu, additional, Taketani, Hiroshi, additional, Iwahashi, Makio, additional, Hisatake, Kazuo, additional, Fukushima, Yasutaka, additional, Matsuda, Takeshi, additional, and Taniguchi, Takashi, additional

Published
1988
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49. A Method for Preparing A Large Sized, Uniform and Stable Built-up Film of109Cd Icosanoate as A Radioactive Source by Utilization of an Extremely Small Amount of Substrate Solution

Author

Iwahashi, Makio, primary, Naito, Fujio, additional, Watanabe, Norifumi, additional, Seimiya, Tsutomu, additional, Morikawa, Naotake, additional, Nogawa, Norio, additional, Ohshima, Takayoshi, additional, Kawakami, Hirokane, additional, Ukai, Kumataro, additional, Sugai, Isao, additional, Shibata, Seiichi, additional, Yasuda, Takahiro, additional, Shoji, Yoshihiko, additional, Suzuki, Takeshi, additional, Nagafuchi, Teruyasu, additional, Taketani, Hiroshi, additional, Matsuda, Takeshi, additional, Fukushima, Yasutaka, additional, Fujioka, Manabu, additional, and Hisatake, Kazuo, additional

Published
1985
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50. A method to detect low-level 63Ni activity for estimating fast neutron fluence from the Hiroshima atomic bomb

Author

Imamura, Mineo, Shizuma, Kiyoshi, Ito, Yutaka, Nogawa, Norio, Shibata, Seiichi, Uwamino, Yoshitomo, and Shibata, Tokushi

Subjects
NUCLEAR weapons, RADIATION dosimetry
Abstract

The Hiroshima and Nagasaki atomic bombs resulted in the worst reported exposure of radiation to the human body. The data of survivors have provided the basis for the risk estimation for ionizing radiation, and thus are widely used as the basis of radiation safety. In this report we have studied a new method to detect the low-level 63Ni activity in copper samples in order to estimate the fast neutronfluence from the Hiroshima atomic bomb. Only 0.8 x 10-3 Bq g-1 of 63Ni is expected to be produced by theatomic bomb in a copper sample with the 63Cu(n, p)63 Ni reaction at a distance of 500 m from the hypocenter. Our method has the required level of sensitivity for determination of the fast neutron fluence out to distances of at least 500 m, and perhaps as far as 1,000 m. We have already investigated and collected some bomb-irradiated copper samples for further study. [ABSTRACT FROM AUTHOR]

Published
1999

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