Investigation of Cerenkov counting of environmental strontium-90

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A typical liquid scintillation counter was evaluated for detection of low levels of /sup 90/Sr-Y. A blank of about 5 cpm and /sup 90/Y efficiency of 42% were obtained for 20-ml samples. The corresponding minimum detectable concentration for a 100-minute count is 0.03 pCi/ml, so that measurement of water samples can readily be made at the maximum permissible concentration for /sup 90/Sr, 0.3 pCi/ml. The efficiency for /sup 90/Sr is less than 0.4%, 1.4% for /sup 137/Cs, and less than 0.04% for gamma-emitting /sup 85/Sr, a useful tracer. Some data for /sup 90/Y efficiencies and blanks are given for other ... continued below

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Pages: 9

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Reynolds, S.A. & Eldridge, J.S. January 1, 1979.

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A typical liquid scintillation counter was evaluated for detection of low levels of /sup 90/Sr-Y. A blank of about 5 cpm and /sup 90/Y efficiency of 42% were obtained for 20-ml samples. The corresponding minimum detectable concentration for a 100-minute count is 0.03 pCi/ml, so that measurement of water samples can readily be made at the maximum permissible concentration for /sup 90/Sr, 0.3 pCi/ml. The efficiency for /sup 90/Sr is less than 0.4%, 1.4% for /sup 137/Cs, and less than 0.04% for gamma-emitting /sup 85/Sr, a useful tracer. Some data for /sup 90/Y efficiencies and blanks are given for other liquid scintillation counters. Chemical treatments are necessary in some cases to concentrate /sup 90/Sr-Y, to remove colored substances which cause quenching, or to eliminate interfering radionuclides. However, the manipulations need not be as elaborate as in conventional radiochemical analysis methods for /sup 90/Sr. Ferric ion (yellow) quenches at the 5 ppM level, but the interference can be eliminated by adding a reducing agent. The Rn daughter /sup 214/Bi, an interfering radionuclide, disappears by decay in 2-3 hours after removal of Rn by sweeping with air or gas. Concentration-separation methods studied have included precipitation and ion exchange.

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Pages: 9

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Dep. NTIS, PC A02/MF A01.

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  • International conference on liquid scintillation counting--recent applications and development, San Francisco, CA, USA, 21 Aug 1979

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  • Report No.: CONF-790859-1
  • Grant Number: W-7405-ENG-26
  • Office of Scientific & Technical Information Report Number: 5918765
  • Archival Resource Key: ark:/67531/metadc1097738

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1979

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  • Feb. 18, 2018, 3:59 p.m.

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  • May 15, 2018, 1:44 p.m.

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Reynolds, S.A. & Eldridge, J.S. Investigation of Cerenkov counting of environmental strontium-90, article, January 1, 1979; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1097738/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.