Gamma-ray spectrometry of humans at the University of Utah
- 1 June 1979
- journal article
- research article
- Published by Springer Nature in Radiation and Environmental Biophysics
- Vol. 16 (2), 157-175
- https://doi.org/10.1007/bf01323223
Abstract
A human total-body counter was designed and built with two 20 × 10 cm NaI (Tl) crystals suspended over an “isoresponse surface” upon which the subject reclines. This surface is curved from head to knee and from left to right, so that a gamma-ray emitting object is detected with equal efficiency when placed anywhere upon it. The positioner and detectors are housed in a low background enclosure constructed of steel 31 cm thick with a graded inner lining of lead + cadmium + copper. Calibration of the system was accomplished by administering trace amounts of various radionuclides to 48 human subjects of various sizes, ranging in age from 4–80 years. Counting rates per retained μCi at 0.53, 0.66, 1.53, and 2.75 MeV (83Rb,137Cs,42K, and24Na) were determined as a function of body size and were compared with counting rates per μCi of corresponding emitters centered in a polyethylene cylinder of radius 10.3 cm. Limits of detection, corresponding to three times the standard deviation of a 50 min background, were 170 nCi90Sr (via Bremsstrahlung X-rays), 0.78 nCi131I, 0.48 nCi83Rb, 0.52 nCi137Cs, 4.9 nCi40K (or 5.8 g of natural potassium), and 1.7 nCi222Rn.This publication has 14 references indexed in Scilit:
- 9OSr +90Y bremsstrahlung efficiency predicted for humansRadiation and Environmental Biophysics, 1976
- NaI(Tl) detector efficiency calculations for distributed sources in a human phantomThe International Journal of Applied Radiation and Isotopes, 1975
- Meson Dosimetry for the Natural EnvironmentRadiation Research, 1973
- Metabolism of 83 Rb and 137 Cs in Persons with Muscle DiseaseRadiation Research, 1973
- Self-attenuation and geometry in single-crystal whole-body spectrometry. application to total potassium measurement in manCellular and Molecular Life Sciences, 1968
- Penetration of high-energy neutrons in iron-water mixturesJournal of Nuclear Energy, 1967
- Estimation of the Total Hydrogen Content of the Human BodyNature, 1966
- Cosmic-Ray Contribution to the Background of NaI Scintillation SpectrometersJapanese Journal of Applied Physics, 1965
- An Improved Whole-Body Counting Geometry with a Single NaI (Tl) Detector (8 × 4 Inches)Radiology, 1964
- On the Mechanism of Production of the Neutron Component of the Cosmic RadiationPhysical Review B, 1949