Self-attenuation and geometry in single-crystal whole-body spectrometry. application to total potassium measurement in man

Joyet, G.; Baudraz, A.

doi:10.1007/bf02138624

Cited by 5 publications

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3). It has been reported (Joyet and Baudraz, 1968;May and Marinelli, 1962;Schmier, 1969) that whereas the background recorded by a shielded NaI (T1) crystal above about 3 MeV is mainly due to the cosmic radiation, the lines in the spectrum representing 4°K, 214pb, and 214Bi largely result from radioactivity in the crystal assembly, principally the photomultiplier tubes. 3 (see table 3) spectrum which is considered.…”

Section: B a C K G R O U N Dmentioning

confidence: 99%

Gamma-ray spectrometry of humans at the University of Utah

Lloyd

Mays

Taysum

1979

Radiat Environ Biophys

View full text Add to dashboard Cite

A human total-body counter was designed and built with two 20 X 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 muCi at 0.53, 0.66, 1.53, and 2.75 MeV (83Rb, 137Cs, 42K, and 24Na) were determined as a function of body size and were compared with counting rates per muCi 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 nCi 90Sr (via Bremsstrahlung X-rays), 0.78 nCi 131I, 0.48 nCi 83Rb, 0.52 nCi 137 Cs, 4.9 nCi 40K (or 5.8 g of natural potassium) and 1.7 nCi 222Rn.

show abstract

Section: B a C K G R O U N Dmentioning

confidence: 99%