Vertical distributions of (99)Tc and the (99)Tc/(137)Cs activity ratio in the coastal water off Aomori, Japan.

Abstract:

:Using a sector-field ICP-MS the vertical distributions of the (99)Tc concentration and (99)Tc/(137)Cs activity ratio were measured in the coastal waters off Aomori Prefecture, Japan, where a spent-nuclear-fuel reprocessing plant has begun test operation. The (99)Tc concentrations in surface water ranged from 1.8 to 2.4 mBq/m(3), no greater than the estimated background level. Relatively high (99)Tc/(137)Cs activity ratios (10-12 × 10(-4)) would be caused by the inflow of the high-(99)Tc/(137)Cs water mass from the Japan Sea. There is no observable contamination from the reprocessing plant in the investigated area. The (99)Tc concentration and the (99)Tc/(137)Cs activity ratio in water column showed gradual decreases with depth. Our results implied that (99)Tc behaves in a more conservative manner than (137)Cs in marine environments.

journal_name

J Environ Radioact

authors

Nakanishi T,Zheng J,Aono T,Yamada M,Kusakabe M

doi

10.1016/j.jenvrad.2011.04.008

subject

Has Abstract

pub_date

2011-08-01 00:00:00

pages

774-9

issue

8

eissn

0265-931X

issn

1879-1700

pii

S0265-931X(11)00080-4

journal_volume

102

pub_type

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