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Journal Articles

Morphological reproductive characteristics of testes and fertilization capacity of cryopreserved sperm after the Fukushima accident in raccoon (${it Procyon lotor}$)

Komatsu, Kazuki*; Iwasaki, Tsugumi*; Murata, Kosuke*; Yamashiro, Hideaki*; Goh, V. S. T.*; Nakayama, Ryo*; Fujishima, Yohei*; Ono, Takumi*; Kino, Yasushi*; Shimizu, Yoshinaka*; et al.

Reproduction in Domestic Animals, 56(3), p.484 - 497, 2021/03

We have established an archive system of livestock and wild animals from the surrounding ex-evacuation zone. Wildlife within the alert zone have been exposed to low-dose-rate (LDR) radiation for a long and continuous time. In this study, we analysed the morphological characteristics of the testes and in vitro fertilization (IVF) capacity of cryopreserved sperm of raccoons from the ex-evacuation zone of the FDNPP accident. This study revealed that the chronic and LDR radiation exposure associated with the FDNPP accident had no adverse effect on the reproductive characteristics and functions of male raccoons.

JAEA Reports

Investigation on sealing in geological disposal

Aoki, Kenji*; Hibiya, Keisuke*; Shiogama, Yukihiro*; Toida, Masaru*; Yamamoto, T.*; Yoshida, Hiroshi*; Banno, K.*; Kubota, T.*; Shimizu, Y.*; Okutsu, Kazuo*; et al.

PNC TJ1100 94-001, 69 Pages, 1994/02

PNC-TJ1100-94-001.pdf:4.56MB

None

JAEA Reports

Investigation of sealing in geological disposal

Yoshida, Hiroshi*; Nishi, K.*; Isobe, T.*; Banno, K.*; Sawauchi, Y.*; Shimizu, Y.*; Shiozaki, N.*; Tanaka, K.*; Furuichi, Mitsuaki*

PNC TJ1100 93-002, 118 Pages, 1993/02

PNC-TJ1100-93-002.pdf:5.07MB

None

JAEA Reports

Preliminary study on lithium-salt aqueous solution blanket

Yoshida, Hiroshi; Naruse, Yuji; Yamaoka, Mitsuaki*; *; *; *

JAERI-M 92-088, 105 Pages, 1992/06

JAERI-M-92-088.pdf:2.45MB

no abstracts in English

JAEA Reports

Investigation of sealing in geological disposal

Yoshida, Hiroshi*; Nishi, K.*; Isobe, T.*; Banno, K.*; Sawauchi, Y.*; Ishihara, K.*; Nakajima, K.*; Tanaka, K.*; Furuichi, Mitsuaki*

PNC TJ1100 92-002, 85 Pages, 1992/02

PNC-TJ1100-92-002.pdf:6.07MB

no abstracts in English

JAEA Reports

Investigation of sealing in geological disposal

Yoshida, Hiroshi*; Nishi, K.*; Isobe, T.*; Banno, K.*; Sawauchi, Y.*; Ishihara, K.*; Furuichi, Mitsuaki*

JNC TJ1400 2005-009, 150 Pages, 1992/02

JNC-TJ1400-2005-009.pdf:12.18MB

no abstracts in English

Oral presentation

Study on transport of radionuclides in watershed environment

Nakanishi, Takahiro; Tsuruta, Tadahiko; Funaki, Hironori; Sakuma, Kazuyuki; Miura, Tomisato*; Yoshida, Mitsuaki*

no journal, , 

To elucidate the mechanism of transport of dissolved radiocesium to masu trout, a feeding experiment was conducted in a culture pond introduced with mountain stream water (dissolved $$^{137}$$Cs concentration: 0.1 - 0.2 Bq/L) using a non-contaminated bait. The $$^{137}$$Cs concentration in the muscle of the adult masu trout (n = 10) was relatively high, showing individual differences (30 - 200 Bq/kg-wet). Pond bottom gravel was found in their stomach, suggesting a source of $$^{137}$$Cs other than bait and stream water. As a result of dietary analysis using stable isotope ratios, the contribution of aquatic organisms was higher in masu trout with higher $$^{137}$$Cs concentration in the muscle. This suggests that the $$^{137}$$Cs concentration in masu trout does not exceed the Japanese limit of 100 Bq/kg for general foodstuffs by transport only from the dissolved $$^{137}$$Cs.

Oral presentation

Assessment of chromosome translocation in wild Japanese macaques in Fukushima

Fujishima, Yohei*; Suzuki, Masatoshi*; Goh, V. S. T.*; Ariyoshi, Kentaro*; Kasai, Kosuke*; Nakata, Akifumi*; Kino, Yasushi*; Oka, Toshitaka; Shinoda, Hisashi*; Shimizu, Yoshinaka*; et al.

no journal, , 

After the Fukushima Daiichi Nuclear Power Plant accident, the surrounding environment was contaminated with radionuclides. Although the ambient dose rates are decreasing, prolonged effects of chronic low-dose exposure on animals are expected to be seen in the coming years. It is necessary to assess the effects of radioactivity on the wild animals in this area to better understand about the risk of low dose radiation. The chromosome translocation frequency of Japanese macaques were significantly higher in Fukushima groups comparing from control groups in Miyagi. Furthermore, chromosome translocation frequencies tended to correlate between external doses or internal dose-rates. However, chromosome translocation frequency was decreasing year by year, which may reflect restoration of environments such as decreasing of ambient dose-rates and decontamination efforts.

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