Potential errors in body composition as estimated by whole body scintillation counting
Vigorous exercise has been reported to increase the apparent potassium content of athletes measured by whole body gamma ray scintillation counting of /sup 40/K. The possibility that this phenomenon is an artifact was evaluated in three cyclists and one nonathlete after exercise on the road (cyclists) or in a room with a source of radon and radon progeny (nonathlete). The apparent /sup 40/K content of the thighs of the athletes and whole body of the nonathlete increased after exercise. Counts were also increased in both windows detecting /sup 214/Bi, a progeny of radon. /sup 40/K and /sup 214/Bi counts were highly correlated (r . 0.87, p less than 0.001). The apparent increase in /sup 40/K was accounted for by an increase in counts associated with the 1.764 MeV gamma ray emissions from /sup 214/Bi. Thus a failure to correct for radon progeny would cause a significant error in the estimate of lean body mass by /sup 40/K counting.
- Research Organization:
- Department of Physics and Health, University of North Dakota
- OSTI ID:
- 5763009
- Journal Information:
- J. Lab. Clin. Med.; (United States), Vol. 101:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
POTASSIUM 40
WHOLE-BODY COUNTING
BISMUTH 214
CORRELATIONS
DYNAMIC FUNCTION STUDIES
ERRORS
EXERCISE
LABELLED COMPOUNDS
LEGS
MAN
POTASSIUM
SCINTILLATION COUNTING
TRACER TECHNIQUES
ALKALI METAL ISOTOPES
ALKALI METALS
ALPHA DECAY RADIOISOTOPES
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BISMUTH ISOTOPES
BODY
BODY AREAS
COUNTING TECHNIQUES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
HEAVY NUCLEI
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
LIMBS
MAMMALS
METALS
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-ODD NUCLEI
POTASSIUM ISOTOPES
PRIMATES
RADIOISOTOPES
VERTEBRATES
YEARS LIVING RADIOISOTOPES
551001* - Physiological Systems- Tracer Techniques