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9OSr +90Y bremsstrahlung efficiency predicted for humans

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Summary

Bremsstrahlung x-rays are produced when energeticβ-particles are emitted and absorbed. Measurements of total-body bremsstrahlung efficiency (x-ray photon output per εCi90Sr in the body, relative to that in water) have been made in the intact mouse, rat, rabbit, and dog sacrificed 2 weeks after the injection of90Sr +85Sr. Efficiencies were determined by a comparison of the bremsstrahlung output from90Sr + its daughter90Y and the gamma-ray emission of85Sr. Results were checked by aβ-assay of the ashed animals. Bremsstrahlung efficiencies averaged 1.10 in a 0.04 kg mouse, 1.14 in a 0.13 kg rat, 1.23 in a 2.6 kg rabbit, and 1.32 in an 8.5 kg beagle. Extrapolating to a 70 kg human, a relative bremsstrahlung efficiency of about 1.4 is predicted. An estimate was made of the90Sr body content in a former dial painter based on in vivo counting and a bremsstrahlung efficiency of 1.39 predicted for a 55 kg human female by these animal data. Our value of 1.42 ± 0.08 μCi90Sr was in good agreement with corresponding results reported for this subject by 8 other laboratories.

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Authors and Affiliations

  1. Radiobiology Laboratory, University of Utah, College of Medicine, 84132, Salt Lake City, Utah, USA

    R. D. Lloyd, C. W. Mays, D. R. Atherton & G. N. Taylor

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  1. R. D. Lloyd
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  2. C. W. Mays
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  3. D. R. Atherton
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  4. G. N. Taylor
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Supported by USERDA Contract E (11-1)-119

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Lloyd, R.D., Mays, C.W., Atherton, D.R. et al. 9OSr +90Y bremsstrahlung efficiency predicted for humans. Radiat Environ Biophys 13, 229–237 (1976). https://doi.org/10.1007/BF01330767

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  • DOI: https://doi.org/10.1007/BF01330767

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