Initial decrease in the ambient dose equivalent rate after the Fukushima accident and its difference from Chernobyl.

ABSTRACT: In 2011, after the Fukushima Dai-ichi Nuclear Power Plant accident, the initial decrease in the ambient dose equivalent rate (dH*(10) dt^-1), an alternative quantity to the effective dose, was studied using monitoring data obtained from March 16, 2011. The dH*(10) dt^-1 was normalized by the ¹³⁷Cs activity per unit area (norm-dH*(10) dt^-1) to analyze the data across monitoring sites with different deposition levels. The norm-dH*(10) dt^-1 showed a rapid decrease during the first 60 days, followed by slow decrease and was modeled using two exponential functions. The norm-dH*(10) dt^-1 obtained in areas dominated by paved surfaces and buildings showed a faster decrease than the unpaved-dominant field, and this decrease was facilit

SUBMITTER: Yoshimura K 

PROVIDER: S-EPMC7051962 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature