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Argon-37 variability in the low troposphere

Purtschert, R.*; Kalinowski, M.*; Riedmann, R.*; Fontaine-Lagrand, J.-E.*; Kusmierczyk-Michulec, J.*; Gheddou, A.*; Bourgouin, P.*; Tomita, Yutaka 

Argon-37 ($$^{37}$$Ar) is produced in the high troposphere by spallation of argon through $$^{40}$$Ar(n,4n)$$^{37}$$Ar and by neutron capture, $$^{36}$$Ar(n,$$gamma$$)$$^{37}$$Ar. The resulting natural equilibrium concentration of $$^{37}$$Ar in the mixed troposphere is about 0.5-1 mBq/m$$^{3}$$. This value may define the background level for the use of $$^{37}$$Ar for search area reduction by means of atmospheric $$^{37}$$Ar measurements in downwind direction of a potential test area in the course of an OSI. In order to investigate long term atmospheric activity levels of $$^{37}$$Ar, bulk air samples were collected close to the CTBTO IMS Radionuclide station located in Takasaki, Japan. In the years 2016-2018 in total 105 air samples were taken and analyzed for their $$^{37}$$Ar activity concentrations with no value exceeding 10 mBq/m$$^{3}$$.

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English

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Volume

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Publication Year/Month

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Meeting title

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CTBT: Science and Technology 2019 Conference (SnT 2019)

Held date

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2019/06

Location (city)

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Vienna

Location (country)

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Austria

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Keywords

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CTBT; OSI; Ar-37; Takasaki

Research Facility

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Press Release

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Article of JAEA R&D Review

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Cooperating Institute

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Universit$"a$t Bern; Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO)

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- Accesses

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