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Radiation Protection Dosimetry Advance Access published online on September 7, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/ncl079
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received February 10, 2006
Revised March 24, 2006
Accepted May 29, 2006

TECHNICAL NOTE

EVALUATION OF FAT-FREE MASS BY WHOLE-BODY COUNTER IN JAPANESE HEALTHY YOUNG ADULTS

Naoko Morita 1, Noboru Takamura 2 *, Tomohiko Murakami 2, Ohzora Jo 2, Kiyoshi Aoyagi 2, Shunichi Yamashita 3, and Yutaka Okumura 1

1 Department of Radiation Biophysics, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
2 Department of Public Health, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
3 Department of Molecular Medicine, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan; Department of Protection of the Human Environment, World Health Organization, Geneva, Switzerland

* To whom correspondence should be addressed.
Noboru Takamura, E-mail: takamura{at}net.nagasaki-u.ac.jp


  Abstract

Whole-body counters (WBCs) are special instruments for measuring internal irradiation doses and are usually housed within or around nuclear facilities in the event of unexpected radiation emergencies. As a substantial proportion of total body potassium (TBK) is found in fat-free mass (FFM), FFM volume can be predicted from WBC-measured 40K. We screened TBK in Japanese healthy young adults using a WBC and found strong linear correlations between TBK and lean body mass (LBM) and body mass index (r = 0.97, P < 0.01 and r = 0.47, P < 0.01, respectively). Multiple linear regression analysis, following adjustments for sex, indicates that only LBM has a significant correlation with TBK (P < 0.01). These results strongly support the feasibility of using WBCs for estimating FFM.


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