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Report No.
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Summary report of ATM and radionuclide data analyses of the common exercise in the East Asia Regional NDC Workshop 2014

Yonezawa, Chushiro*; Yamamoto, Yoichi ; Kijima, Yuichi ; Kalinowski, M.*

The authors present a summary report of the analysis results of ATM (Atmospheric Transport Model) and radionuclide (RN) data of the common exercise in the 2014 East Asia Regional NDC Workshop 2014 (EARNW 2014) held in Ulaanbaatar, Mongolia from 29 July to 1 August, 2014. The exercise scenario was that CTBT-relevant RNs released from a hypothetical target event were detected in particulate and noble gas samples at the Takasaki station (RN38), and the target event was inferred using estimated explosion time from La-140/Ba-140 ratio in the particulate samples. The possible source area was determined through ATM backward tracking of Xe-133. Real observation noble gas data by a certified IMS station and artificially prepared particulate data were used as the fictitious RN data in this exercise. The analysis results of the RN data by the participating NDCs were evaluated by comparing with the prepared values for the particulate and IDC/RRR for the noble gas data. The results of estimated explosion time were evaluated by comparing to the preset value. Released Xe-133 activity from the event and the observable radioactivity concentration of Xe-133 at the IMS station were compared among the reported ATM results.

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