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Kikuchi, Masahiro; Kameya, Hiromi*; Shimoyama, Yuhei; Ukai, Mitsuko*; Kobayashi, Yasuhiko
JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 85, 2014/03
Sato, Toshinori; Tanno, Takeo; Sanada, Hiroyuki; Yokoyama, Tatsuya*; Shimoyama, Masahiro*
Heisei-25 Nendo (2013 Nen) Shigen, Sozai Gakkai Shuki Taikai Koenshu, p.257 - 258, 2013/09
Japan Atomic Energy Agency is operating underground research laboratory projects in order to establish a firm scientific basis for safe geological disposal of HLW. One of these is the Mizunami Underground Research Laboratory (MIU) project focused on crystalline rock. In situ stress measurement by Compact Conical-ended Borehole Overcoring (CCBO) are conducted to understand in situ stress state at 300 m depth.
Tanno, Takeo; Sato, Toshinori; Sanada, Hiroyuki; Hikima, Ryoichi*; Yokoyama, Tatsuya*; Shimoyama, Masahiro*
Heisei-25 Nendo (2013 Nen) Shigen, Sozai Gakkai Shuki Taikai Koenshu, p.255 - 256, 2013/09
rock stresses were measured by Compact Conical-ended Borehole Overcoring (CCBO) technique in the 300m depth gallery at the Mizunami Underground Research Laboratory and the measurement results were evaluated using a conventional method and a new test of strain sensitivity method. To compare the 
rock stress evaluated by both methods, the new test of strain sensitivity method resulted in more accurate evaluation than the conventional method, because of its improved stress deviations.
Kikuchi, Masahiro; Shimoyama, Yuhei; Ukai, Mitsuko*; Kobayashi, Yasuhiko
JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 78, 2013/01
no abstracts in English
Kikuchi, Masahiro; Kameya, Hiromi*; Shimoyama, Yuhei; Ukai, Mitsuko*; Kobayashi, Yasuhiko
Radiation Physics and Chemistry, 81(10), p.1639 - 1645, 2012/10
Times Cited Count：1 Percentile：10.1(Chemistry, Physical)no abstracts in English
Kishida, Keigo*; Kaimori, Yoshihiko*; Kawamura, Shoei*; Sakamoto, Yuki*; Nakamura, Hideo*; Kikuchi, Masahiro; Shimoyama, Yuhei; Kobayashi, Yasuhiko; Ukai, Mitsuko*
Shokuhin Shosha, 47(1), p.1 - 5, 2012/09
no abstracts in English
Kameya, Hiromi*; Kikuchi, Masahiro; Todoriki, Setsuko*; Furuta, Masakazu*; Kobayashi, Yasuhiko; Hara, Hideyuki*; Shimoyama, Yuhei; Ukai, Mitsuko*
Shokuhin Shosha, 47(1), p.6 - 10, 2012/09
no abstracts in English
-irradiated black pepper using pulsed EPR spectroscopyKameya, Hiromi*; Kikuchi, Masahiro; Hara, Hideyuki*; Furuta, Masakazu*; Todoriki, Setsuko*; Kobayashi, Yasuhiko; Ukai, Mitsuko*; Shimoyama, Yuhei
Applied Magnetic Resonance, 42(2), p.153 - 159, 2012/03
Times Cited Count：5 Percentile：30.6(Physics, Atomic, Molecular & Chemical)no abstracts in English
Kikuchi, Masahiro; Sakashita, Tetsuya; Funayama, Tomoo; Ukai, Mitsuko*; Shimoyama, Yuhei; Kobayashi, Yasuhiko
JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 81, 2012/01
no abstracts in English
Kaimori, Yoshihiko; Sakamoto, Yuki*; Kikuchi, Masahiro; Kameya, Hiromi*; Nakamura, Hideo*; Shimoyama, Yuhei; Kobayashi, Yasuhiko; Ukai, Mitsuko*
Shokuhin Shosha, 46(1), p.13 - 18, 2011/09
Kikuchi, Masahiro; Shimoyama, Yuhei; Ukai, Mitsuko*; Kobayashi, Yasuhiko
Radiation Physics and Chemistry, 80(5), p.664 - 667, 2011/05
Times Cited Count：9 Percentile：56.9(Chemistry, Physical)Kikuchi, Masahiro; Shimoyama, Yuhei; Ukai, Mitsuko*; Kobayashi, Yasuhiko
Radioisotopes, 60(4), p.163 - 171, 2011/04
no abstracts in English
Kikuchi, Masahiro; Sakashita, Tetsuya; Funayama, Tomoo; Ukai, Mitsuko*; Shimoyama, Yuhei; Kobayashi, Yasuhiko
JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 85, 2011/01
Kameya, Hiromi*; Kakita, Daisuke*; Kaimori, Yoshihiko*; Kikuchi, Masahiro; Kobayashi, Yasuhiko; Ukai, Mitsuko*; Shimoyama, Yuhei
Radioisotopes, 59(10), p.607 - 614, 2010/10
Mangoes are imported to Japan after treated with hot water. Recently, irradiated mangoes imported to U. S. are widely used. This paper reports on the ESR method for analyzing the radiation induced radicals of irradiated mangoes. Upon the ray irradiation, a strong signal peak in the flesh and skin of mangoes was observed at 
= 2.004. This singlet peak may be attributed to organic free radicals. The ESR spectra of the flesh and skin of mangoes showed the radiation induced radicals due to cellulose by irradiation over 12 kGy. The relaxation time (T1 and T2) of the singlet signal were calculated. T2 showed dose response according to increasing the irradiation dose levels, while T1 was almost constant. The value of (T1T2)1/2 showed the dependence of irradiation dose level.
Kikuchi, Masahiro; Kakita, Daisuke*; Shimoyama, Yuhei; Ukai, Mitsuko*; Kobayashi, Yasuhiko
Shokuhin Shosha, 45(1-2), p.34 - 38, 2010/09
Kikuchi, Masahiro; Hussain, M. S.*; Morishita, Norio; Ukai, Mitsuko*; Kobayashi, Yasuhiko; Shimoyama, Yuhei*
Spectrochimica Acta, Part A, 75(1), p.310 - 313, 2010/01
An electron spin resonance (ESR) spectroscopic study of radicals induced in irradiated fresh mangoes was performed. Mangoes in the fresh state were irradiated with -rays, lyophilized and then crushed into a powder. The ESR spectrum of the powder showed a strong main peak at 
= 2.004 and a pair of peaks centered at the main peak. The main peak was detected from both flesh and skin specimens. This peak height gradually decreased during storage following irradiation. On the other hand, the side peaks showed a well-defined dose-response relationship even at 9 days post-irradiation. The side peaks therefore provide a useful means to define the irradiation of fresh mangoes.
Kikuchi, Masahiro; Hussain, M. S.*; Morishita, Norio; Sakashita, Tetsuya; Funayama, Tomoo; Ukai, Mitsuko*; Shimoyama, Yuhei*; Kobayashi, Yasuhiko
JAEA-Review 2009-041, JAEA Takasaki Annual Report 2008, P. 86, 2009/12
When tropical fruits are imported, quarantine treatments are required for preventing plant pests. The irradiation is a choice of the quarantine treatments for tropical fruits in the world. When the irradiation is utilized as the treatment, detection methods are required to endorse the reliability of labels for consumers. To distinguish the irradiated fresh mangoes from non-irradiated ones, radical detection was carried out using ESR. After freeze-drying mangoes, the ESR main peak was observed but the signal intensity was affected by ripeness and period of storage. We found that the existence of side peaks is an effective indicator to detect fresh mangoes irradiated to dose range of quarantine treatment. Since ESR method is able to measure without complicate preparation, this technique is useful to detect the irradiation treatment against a wide variety of foods.
Kikuchi, Masahiro; Hussain, M. S.*; Morishita, Norio; Ukai, Mitsuko*; Shimoyama, Yuhei*; Kobayashi, Yasuhiko
Radioisotopes, 58(12), p.789 - 797, 2009/12
no abstracts in English
Kikuchi, Masahiro; Ogawa, Hideyuki*; Morishita, Norio; Ukai, Mitsuko*; Kobayashi, Yasuhiko; Shimoyama, Yuhei*
Shokuhin Shosha, 44(1-2), p.9 - 13, 2009/09
no abstracts in English
Hosoda, Hiroshi*; Shimoyama, Masahiro*; Nagano, Shuichi*
JNC TJ7420 2005-042, 62 Pages, 2004/03
JNC-TJ7420-2005-042.PDF:16.23MB
no abstracts in English
