Variability of radiocaesium inventory in Fukushima soil cores from one site measured at different times.
Radiat Prot Dosimetry
; 167(1-3): 344-7, 2015 Nov.
Article
in En
| MEDLINE
| ID: mdl-25969520
ABSTRACT
The Fukushima Daiichi Nuclear Power Plant (FDNPP) accident has resulted in the deposition of radioactive contamination of soils mainly by (134)Cs and (137)Cs. The contaminated areas are of a great concern since external radiation may lead to significant long-term doses to humans and animals. External dose rate above ground will decrease with physical decay of the radionuclides and as they migrate deeper into the soil with time. In the present study, depth profiles of Cs radioisotopes have been studied at different times over a period of 1 y. Radiocaesium inventories for (134)Cs and (137)Cs down to a depth of 10 cm at the four measurement times varied from 2.09 to 4.14 MBq m(-2) with coefficient of variation (CV) 27.4 %, n = 4 and from 2.13 to 4.23 MBq m(-2) with CV 27.3 %, n = 4, respectively. The activity ratio for (134)Cs/(137)Cs decreased from 0.62 to 0.46 during 1 y of measurement i.e. July 2012 to June 2013. However, the ratio with decay correction (15 March 2011) was found to be constant â¼1, indicating contamination from FDNPP origin. In order to understand the radiocaesium distribution in soil profile, physico-chemical characterisation of soil has been carried out.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Radioactive Fallout
/
Soil Pollutants, Radioactive
/
Cesium Radioisotopes
/
Radiation Monitoring
/
Fukushima Nuclear Accident
Type of study:
Diagnostic_studies
/
Evaluation_studies
Country/Region as subject:
Asia
Language:
En
Journal:
Radiat Prot Dosimetry
Year:
2015
Document type:
Article
Affiliation country:
India