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Radiation Protection Dosimetry Advance Access originally published online on September 7, 2006
Radiation Protection Dosimetry 2007 123(1):128-130; 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

TECHNICAL NOTES

Evaluation of fat-free mass by whole-body counter in Japanese healthy young adults

Naoko Morita1, Noboru Takamura2,,*, Tomohiko Murakami2, Ohzora Jo2, Kiyoshi Aoyagi2, Shunichi Yamashita3,4 and Yutaka Okumura1

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
4 Department of Protection of the Human Environment, World Health Organization, Geneva, Switzerland

* Corresponding author: takamura{at}net.nagasaki-u.ac.jp

Received February 10, 2006, amended March 24, 2006, accepted May 29, 2006


  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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