English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Obtaining Pu background data in the environment is essential for contamination source identification and assessment of environmental impact of Pu released from the Fukushima Daiichi nuclear power plant (FDNPP) accident. However, no baseline information on Pu isotopes in Fukushima Prefecture has been reported. Here we analyzed 80 surface soil samples collected from the central-eastern Japan during 1969–1977 for  239+240 Pu activity concentration and  240 Pu/ 239 Pu atom ratio to establish the baseline before the FDNPP accident. We found that  239+240 Pu activity concentrations ranged from 0.004 –1.46 mBq g −1 , and  240 Pu/ 239 Pu atom ratios varied narrowly from 0.148 to 0.229 with a mean of 0.186 ± 0.015. We also reconstructed the surface deposition density of  241 Pu using the  241 Pu/ 239 Pu atom ratio in the Japanese fallout reference material. The obtained results indicated that, for the FDNPP-accident released  241 Pu, a similar radiation impact can be estimated as was seen for the global fallout deposited  241 Pu in the last decades.

Plutonium concentration and isotopic ratio in soil samples from central-eastern Japan collected around the 1970s