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Maurer, C.*; Galmarini, S.*; Solazzo, E.*; Ku
mierczyk-Michulec, J.*; Bar
, J.*; Kalinowski, M.*; Schoeppner, M.*; Bourgouin, P.*; Crawford, A.*; Stein, A.*; et al.
Journal of Environmental Radioactivity, 255, p.106968_1 - 106968_27, 2022/12
Times Cited Count：2 Percentile：14.8(Environmental Sciences)After performing multi-model exercises in 2015 and 2016, a comprehensive Xe-133 atmospheric transport modeling challenge was organized in 2019. For evaluation measured samples for the same time frame were gathered from four International Monitoring System stations located in Europe and North America with overall considerable influence of IRE and/or CNL emissions. As a lesion learnt from the 2nd ATM-Challenge participants were prompted to work with controlled and harmonized model set ups to make runs more comparable, but also to increase diversity. Effects of transport errors, not properly characterized remaining emitters and long IMS sampling times (12 to 24 hours) undoubtedly interfere with the effect of high-quality IRE and CNL stack data. An ensemble based on a few arbitrary submissions is good enough to forecast the Xe-133 background at the stations investigated. The effective ensemble size is below five.
Beziat, G.*; Kalinowski, M.*; Inoue, Naoko; Kusmierczyk-Michulec, J.*; Bar, J.*; Gheddou, A.*; Bourgouin, P.*; Yamamoto, Yoichi; Tomita, Yutaka
no journal, ,
In early 2018, two mobile noble gas measurement systems were deployed and have started measurement at Horonobe and Mutsu in Japan. Together with a third mobile system that will be deployed at Fukuoka, Japan, in spring 2019, and the operating IMS noble gas system at station RN38, Takasaki, Japan, this creates a high density configuration of noble gas measurement systems. The objective of this configuration is to generate a database of detections which will be used to develop and test methods for better understanding the contributions of known sources from across Eurasia. Contributions from these sources are frequently observed at IMS station RN38. The high density configuration will provide a framework to test and optimize source location algorithms and to better understand level C episodes, specifically at JPX38. The three mobile noble gas measurement systems used in this experiment and their operation are externally funded. The planned duration of this experiment is two years.
Purtschert, R.*; Kalinowski, M.*; Riedmann, R.*; Fontaine-Lagrand, J.-E.*; Kusmierczyk-Michulec, J.*; Gheddou, A.*; Bourgouin, P.*; Tomita, Yutaka
no journal, ,
Argon-37 (
Ar) is produced in the high troposphere by spallation of argon through 
Ar(n,4n)Ar and by neutron capture, 
Ar(n,
)Ar. The resulting natural equilibrium concentration of Ar in the mixed troposphere is about 0.5-1 mBq/m
. This value may define the background level for the use of Ar for search area reduction by means of atmospheric 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 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 Ar activity concentrations with no value exceeding 10 mBq/m.
