Production rates of long-lived radionuclides Be and Al under direct muon-induced spallation in granite quartz and its implications for past high-energy cosmic ray fluxes

Sakurai, Hirohisa*; Kurebayashi, Yutaka*; Suzuki, Soichiro*; Horiuchi, Kazuho*; Takahashi, Yui*; Doshita, Norihiro*; Kikuchi, Satoshi*; Tokanai, Fuyuki*; Iwata, Naoyoshi*; Tajima, Yasushi*; et al.

Physical Review D, 109(10), p.102005_1 - 102005_18, 2024/05

https://doi.org/10.1103/PhysRevD.109.102005

Secular variations of galactic cosmic rays (GCRs) are inseparably associated with the galactic activities and should reflect the environments of the local galactic magnetic field, interstellar clouds, and nearby supernova remnants. The high-energy muons produced in the atmosphere by high-energy GCRs can penetrate deep underground and generate radioisotopes in the rock. As long lived radionuclides such as Be and Al have been accumulating in these rocks, concentrations of Be and Al can be used to estimate the long-term variations in high-energy muon yields, corresponding to those in the high-energy GCRs over a few million years. This study measured the production cross sections for muon induced Be and Al by irradiating positive muons with the momentum of 160 GeV/c on the synthetic silica plates and the granite core at the COMPASS experiment line in CERN SPS. In addition, it the contributions of the direct muon spallation reaction and the nuclear reactions by muon-induced particles on the production of long lived radionuclides in the rocks were clarified.

Observation of gamma rays up to 320 TeV from the middle-aged TeV pulsar wind nebula HESS J1849-000

Amenomori, Michihiro*; Tsuchiya, Harufumi; Tibet AS Collaboration*; 116 of others*

Astrophysical Journal, 954(2), p.200_1 - 200_7, 2023/09

https://doi.org/10.3847/1538-4357/acebce

Potential PeVatron supernova remnant G106.3+2.7 seen in the highest-energy gamma rays

Amenomori, Michihiro*; Tsuchiya, Harufumi; Tibet AS Collaboration*; 93 of others*

Nature Astronomy (Internet), 5(5), p.460 - 464, 2021/05

https://doi.org/10.1038/s41550-020-01294-9

Japanese population dose from natural radiation

Omori, Yasutaka*; Hosoda, Masahiro*; Takahashi, Fumiaki; Sanada, Tetsuya*; Hirao, Shigekazu*; Ono, Koji*; Furukawa, Masahide*

Journal of Radiological Protection, 40(3), p.R99 - R140, 2020/09

https://doi.org/10.1088/1361-6498/ab73b1

UNSCEAR and the Nuclear Safety Research Association report the annual effective doses from cosmic rays, terrestrial radiation, inhalation and ingestion from natural sources. In this study, radiation doses from natural radiation sources in Japan were reviewed with the latest knowledge and data. Total annual effective dose from cosmic-ray exposure can be evaluated as 0.29 mSv. The annual effective dose from external exposure to terrestrial radiation for Japanese population can be evaluated as 0.33 mSv using the data of nationwide survey by the National Institute of Radiological Sciences. The Japan Chemical Analysis Center (JCAC) performed the nationwide radon survey using a unified method for radon measurements in indoor, outdoor and workplace. The annual effective dose for radon inhalation was estimated using a current dose conversion factor, and the values were estimated to be 0.50 mSv. The annual effective dose from thoron was reported as 0.09 mSv by UNSCEAR and then the annual effective dose from inhalation can be described as 0.59 mSv. According to the report of large scale survey of foodstuff by JCAC, the effective dose from main radionuclides due to dietary intake can be evaluated to be 0.99 mSv. Finally, Japanese population dose from natural radiation can be assessed as 2.2 mSv which is near to the world average value of 2.4 mSv.

Microbeams of heavy charged particles

Kobayashi, Yasuhiko; Funayama, Tomoo; Wada, Seiichi; Furusawa, Yoshiya*; Aoki, Mizuho*; Shao, C.*; Yokota, Yuichiro; Sakashita, Tetsuya; Matsumoto, Yoshitaka*; Kakizaki, Takehiko; et al.

Uchu Seibutsu Kagaku, 18(4), p.235 - 240, 2004/12

https://doi.org/10.2187/bss.18.235

no abstracts in English

Detection of DNA damage induced by heavy ion irradiation in the individual cells with comet assay

Wada, Seiichi; Natsuhori, Masahiro*; Ito, Nobuhiko*; Funayama, Tomoo; Kobayashi, Yasuhiko

Nuclear Instruments and Methods in Physics Research B, 206, p.553 - 556, 2003/05

https://doi.org/10.1016/S0168-583X(03)00820-6

Determining the biological effects of a very low number of charged particles crossing the cell nucleus is interest for estimating the risk due to environmental exposure to charged particles. Especially it is necessary to detect the radiation damage induced by a precise number of charged particles in the individual cells. To compare the number of ions traversing the cell and the DNA damage produced by the hit ions, we applied comet assay. Cells attached on the ion track detector CR-39 were irradiated with 17.3 MeV/u 12C, 15.7 MeV/u, 10.4 MeV/u 20Ne and 6.9 MeV/u 40Ar ion beams at TIARA, JAERI-Takasaki. After irradiation, CR-39 was covered with 1 % agarose. After electrophoresis the CR-39 was taken off from the slide glass. The agarose gel on the CR-39 was stained with ethidium bromide and the opposite side of the CR-39 was etched with KOH-ethanol solution at 37 . We observed that the ion particles with higher LET value induced the heavier DNA damage, even by the same number of ion-hits within the irradiated cells.

Properties of TNF-1 track etch detector

Ogura, K.*; Asano, Masaharu; Yasuda, Nakahiro*; Yoshida, Masaru

Nuclear Instruments and Methods in Physics Research B, 185(1-4), p.222 - 227, 2001/12

https://doi.org/10.1016/S0168-583X(01)00816-3

no abstracts in English

Simplified technique for measurement and evaluation of indoor cosmic ray dose rate using a 3 dia. spherical NaI(Tl) scintillation detector

Nagaoka, Toshi; Moriuchi, Shigeru; Sakamoto, Ryuichi; Saito, Kimiaki; Tsutsumi, Masahiro

Hoken Butsuri, 30, p.9 - 14, 1995/00

https://doi.org/10.5453/jhps.30.9

no abstracts in English

Evaluation of dose contribution of self-irradiation and cosmic-ray to glass dosemeter for environmental radiation measurement

Sakamoto, Ryuichi; Nagaoka, Toshi; Saito, Kimiaki; Tsutsumi, Masahiro; Moriuchi, Shigeru

JAERI-M 94-060, 21 Pages, 1994/03

JAERI-M-94-060.pdf:0.98MB

no abstracts in English

Environmental radiation data, 9; Background dose rates in and around Tokyo etc. measured with portable instruments, Feb.,1991 - Mar.,1993

Nagaoka, Toshi; Sakamoto, Ryuichi; Saito, Kimiaki; Tsutsumi, Masahiro; Moriuchi, Shigeru

JAERI-M 93-125, 41 Pages, 1993/06

JAERI-M-93-125.pdf:1.08MB

no abstracts in English