Evaluation of the beta energy spectrum from a distributed uranium mill tailings source.
The beta energy spectra from uranium mill tailings, 90Sr with different absorber thicknesses, and a uranium metal slab were measured and compared to select an appropriate beta source for calibrating a personal dosimeter to measure shallow dose equivalent when exposed to uranium mill tailings. The measured beta energy spectrum from the 90Sr source, with a 111 mg cm-2 cover thickness, was selected as a possible calibration source for a personnel dosimeter. The dose equivalent rate to the skin at 1 cm from a distributed tailings source of infinite thickness, with a 226Ra activity of 56 Bq g-1 (1.5 x 10(3) pCi g-1), was measured to be 0.024 mSv h-1 (2.4 mrem h-1).
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RH
RUST Remedial Services, Inc., Albuquerque, NM 87106.
Martz
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DE
Carlson
D S
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Turner
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JB
D001610:Beta Particles; D004781:Environmental Exposure; D004867:Equipment Design; D006801:Humans; D008669:Metallurgy; D011850:Radioactive Waste; D011874:Radiometry / Q000295:instrumentation; D014501:Uranium
D011850:Radioactive Waste; D014501:Uranium