Radiation protection dosimetry最新文献_第6页

Development of α-ray visualization survey meter in high gamma and neutron background environment. 开发高伽马和中子背景环境下的α射线可视化测量仪。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-13 DOI: 10.1093/rpd/ncae169

Youichi Tsubota, Kenji Kobayashi, Tatsuya Ishii, Misaki Hirato, Satoshi Shioya, Takahiro Nakagawa

{"title":"Development of α-ray visualization survey meter in high gamma and neutron background environment.","authors":"Youichi Tsubota, Kenji Kobayashi, Tatsuya Ishii, Misaki Hirato, Satoshi Shioya, Takahiro Nakagawa","doi":"10.1093/rpd/ncae169","DOIUrl":"https://doi.org/10.1093/rpd/ncae169","url":null,"abstract":"A survey meter was developed to reliably detect and visualize surface contamination of suits and objects by α-nuclides in high γ/n-rays background radiation environment. The survey meter features a semi-opaque ZnS:Ag scintillator mounted directly onto a multi-anode photomultiplier tube (MA-PMT) and amplification circuits, ensuring output gain equalization for all channels. α-ray events induce localized light emission in thin-film scintillators. By directly mounting the scintillator, diffusion of light before reaching the MA-PMT is suppressed, concentrating it in just a few channels, thereby facilitating discrimination from background radiation. This design also enables clear visualization of the shape of surface contamination. The prototyped survey meter is capable of responding up to 2.1 × 107 cpm, with no γ-ray response even in high-radiation environments exceeding 1 Sv/h. In actual environments with high background radiation, contamination of ~1/100th of the surface contamination density limit of 4 Bq/cm2 could be reliably detected.","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tritium concentration in monthly precipitation in Okinawa and Kagoshima, southern Japan. 日本南部冲绳和鹿儿岛月降水中的氚浓度。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-13 DOI: 10.1093/rpd/ncae021

Naofumi Akata, Kaho Ohno, Haruka Kuwata, Khemruthai Kheamsiri, Yukiko Yoshinaka, Ryohei Yamada, Yuisa Kitayama, Sana Aizawa, Shunya Nakasone, Akinobu Ishimine, Masahiro Tanaka, Yoshitaka Shiroma, Shinji Tokonami, Masahide Furukawa

引用次数: 0

Investigating the association between dry deposition of cesium and different growth stages of aboveground parts of Chinese yam. 研究铯的干沉积与中国山药地上部分不同生长阶段的关系。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-13 DOI: 10.1093/rpd/ncae103

Shogo Imada, Hitoshi Kawabata, Masumi Yanai

引用次数: 0

Construction of a realistic voxel phantom of the Japanese red fox (Vulpes vulpes japonica) based on MRI imaging and estimation of its background external radiation dose rate from environmental radionuclides. 基于核磁共振成像技术构建逼真的日本赤狐（Vulpes vulpes japonica）体素模型，并估算环境放射性核素的本底外辐射剂量率。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-13 DOI: 10.1093/rpd/ncae038

Yoshihito Ohtsuka, Shun'ichi Hisamatsu

{"title":"Construction of a realistic voxel phantom of the Japanese red fox (Vulpes vulpes japonica) based on MRI imaging and estimation of its background external radiation dose rate from environmental radionuclides.","authors":"Yoshihito Ohtsuka, Shun'ichi Hisamatsu","doi":"10.1093/rpd/ncae038","DOIUrl":"https://doi.org/10.1093/rpd/ncae038","url":null,"abstract":"In this study, we selected the Japanese red fox (Vulpes vulpes japonica) as a representative mid-size mammal from the forests near the spent nuclear fuel reprocessing plant at Rokkasho. A fox voxel phantom was constructed based on magnetic resonance imaging of a female red fox caught in Rokkasho. This phantom consisted of 264 × 321 × 383 voxels (each voxel size: 0.78 × 0.78 × 2 mm) with internal organs. The external radiation dose rate to the voxel phantom by beta and gamma rays from environmental radionuclides was estimated using a Monte Carlo code (EGS4 and UCPIXEL). We estimated the dose rates to the phantom on the ground and in an average fox burrow in the Rokkasho forest, which were 11 and 27 nGy h-1, respectively. Assuming that the animal on the ground was irradiated by cosmic rays of 27 nGy h-1, the total external dose rate was evaluated to be 38 nGy h-1. Based on the assumption that the fox lives on the ground for 12 h and in the burrow for 12 h, the dose rate was estimated to be 33 nGy h-1.","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Long-term effects of continuous low dose-rate gamma-ray irradiation on mouse hematopoietic cells. 连续低剂量率伽马射线辐照对小鼠造血细胞的长期影响

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-13 DOI: 10.1093/rpd/ncae153

Takanori Yanai, Syouko Kanaiwa-Kudo, Akiko Abe, Mikio Saitou, Shingo Nakamura, Satoshi Tanaka, Jun-Ichiro Komura, Toshiyuki Kobayashi

{"title":"Long-term effects of continuous low dose-rate gamma-ray irradiation on mouse hematopoietic cells.","authors":"Takanori Yanai, Syouko Kanaiwa-Kudo, Akiko Abe, Mikio Saitou, Shingo Nakamura, Satoshi Tanaka, Jun-Ichiro Komura, Toshiyuki Kobayashi","doi":"10.1093/rpd/ncae153","DOIUrl":"https://doi.org/10.1093/rpd/ncae153","url":null,"abstract":"The present work investigates the long-term effects of continuous low dose-rate (20 mGy/day to total doses of 1-8 Gy) gamma-ray exposure on the hematopoietic cells of specific pathogen-free C3H/HeN mice. Peripheral white blood cell (WBC) counts decreased on days 206, 471, and 486, with no significant changes in red blood cell (RBC) and platelet (PLT) counts. The number of colony forming units (CFU-S and CFU-GM) in the bone marrow and spleen from irradiated mice decreased with increasing total dose on day-12 and day-7. The decrease in bone marrow CFU-S persisted throughout the 400-day irradiation period and did not show any recovery up to 210 days postirradiation. These findings suggest that the effects of low-dose-rate (LDR) radiation on the hematopoietic system remain long after the 400-day irradiation was completed. Further investigation showed no significant difference in life spans of non-irradiated W/Wv (c-kit-deficient) mice inoculated with hematopoietic stem cells from irradiated (20 mGy/day for 400 days) or nonirradiated wild-type mice. These results suggest that the effects of continuous low-dose-rate irradiation are more pronounced in hematopoietic stromal cells than in HSCs themselves.","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effects of antioxidant administration in the early stages of radiation-induced tumorigenesis. 在辐射诱导肿瘤发生的早期阶段服用抗氧化剂的效果。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-13 DOI: 10.1093/rpd/ncae145

Kazumi Yamauchi, Yuki Tsutsumi, Toshiyuki Kobayashi, Jun-Ichiro Komura

{"title":"The effects of antioxidant administration in the early stages of radiation-induced tumorigenesis.","authors":"Kazumi Yamauchi, Yuki Tsutsumi, Toshiyuki Kobayashi, Jun-Ichiro Komura","doi":"10.1093/rpd/ncae145","DOIUrl":"https://doi.org/10.1093/rpd/ncae145","url":null,"abstract":"ApcMin/+ mouse was a model mouse for human familial adenomatous polyposis, and irradiation at an early age increases tumors in the small and large intestine. To study the effects of antioxidant administration on tumor incidence after continuous whole-body exposure to gamma rays, ApcMin/+ mice were exposed to a medium-dose-rate, 200 mGy/d, from postnatal Day 0 to 21 of age or a high-dose-rate of 0.65 Gy/min (total dose 4.2 Gy) on postnatal Day 7. The dams and pups were supplied with the N-acetylcysteine (NAC) in drinking water (7 g/L), from gestation Day 15 until weaning (21 days-old). A significant increase in the number of intestinal tumors were observed in ApcMin/+ mice irradiated with high dose-rate gamma rays as compared with the non-irradiated controls, but there was no significant difference in tumor counts between the non-irradiated controls and the medium-dose rate irradiation groups. NAC administration did not have any significant effect at least at this dose. These results suggest that the supplementation of anti-oxidant at the early stage of tumorigenesis does not suppress the formation of irradiation-induced small intestinal tumors.","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preface. 序言

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-13 DOI: 10.1093/rpd/ncae205

Shinji Tokonami, Yoshiya Shimada, Shinji Ueda, James Mc Laughlin, Tibor Kovács

引用次数: 0

Radiation dose estimation for indoor radon, thoron and their progenies using a stochastic method-a small-scale survey in Wuhan, China. 使用随机方法估算室内氡、钍及其衍生物的辐射剂量--中国武汉的小规模调查。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-13 DOI: 10.1093/rpd/ncae012

Jun Hu, Chutima Kranrod, Yasutaka Omori, Masahiro Hosoda, Shinji Tokonami

引用次数: 0

Spectroscopic analysis of alpha particles from radioactive nuclides with CR-39 plastic nuclear track detectors. 利用 CR-39 塑料核轨道探测器对放射性核素的阿尔法粒子进行光谱分析。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-13 DOI: 10.1093/rpd/ncae068

Satoshi Kodaira, Miroslaw Janik

引用次数: 0

Characteristics of tritium, stable isotopes and chemical components in monthly precipitation at Hiroshima, Japan. 日本广岛月降水中的氚、稳定同位素和化学成分的特征。

IF 0.8 4区环境科学与生态学

Radiation protection dosimetry Pub Date : 2024-11-13 DOI: 10.1093/rpd/ncae024

Ryohei Yamada, Haruka Kuwata, Khemruthai Kheamsiri, Kaho Ohno, Yuisa Kitayama, Yukiko Yoshinaka, Shinji Yoshinaga, Naoyuki Kurita, Naofumi Akata

{"title":"Characteristics of tritium, stable isotopes and chemical components in monthly precipitation at Hiroshima, Japan.","authors":"Ryohei Yamada, Haruka Kuwata, Khemruthai Kheamsiri, Kaho Ohno, Yuisa Kitayama, Yukiko Yoshinaka, Shinji Yoshinaga, Naoyuki Kurita, Naofumi Akata","doi":"10.1093/rpd/ncae024","DOIUrl":"https://doi.org/10.1093/rpd/ncae024","url":null,"abstract":"This article mainly discusses tritium concentrations in monthly precipitation at Hiroshima City during 2021. The tritium concentrations, which were measured with a low background liquid scintillation counter, fluctuated from 0.16 to 0.78 Bq L-1. Additionally, hydrogen and oxygen stable isotopes and ionic species were measured in order to characterize precipitation, and their trends including tritium concentrations were compared with data collected in other regions of Japan in previous studies. Although the results showed the characteristics of precipitation were similar to those observed in the other regions, the tritium concentrations were found to be contrary to behavior expected from the latitude effect and some of the observed ionic components were suggested to be continental in origin. Since these results are not common at other sites in Japan, the tritium concentration in the westernmost region of Honshu, including Hiroshima City, may be influenced by Asian continental influences.","PeriodicalId":20795,"journal":{"name":"Radiation protection dosimetry","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0