Investigation of Cerenkov counting of environmental strontium-90
Conference
·
OSTI ID:5918765
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.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5918765
- Report Number(s):
- CONF-790859-1
- Country of Publication:
- United States
- Language:
- English
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·
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OSTI ID:6396402
Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400103* -- Radiometric & Radiochemical Procedures-- (-1987)
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BISMUTH 214
BISMUTH ISOTOPES
CHERENKOV COUNTING
COUNTING TECHNIQUES
DAYS LIVING RADIOISOTOPES
ELEMENTS
EVEN-EVEN NUCLEI
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
INTERFERING ELEMENTS
INTERMEDIATE MASS NUCLEI
IRON
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIQUID SCINTILLATION DETECTORS
MEASURING INSTRUMENTS
METALS
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-ODD NUCLEI
RADIATION DETECTORS
RADIOISOTOPES
SCINTILLATION COUNTERS
STRONTIUM 90
STRONTIUM ISOTOPES
TRANSITION ELEMENTS
YEARS LIVING RADIOISOTOPES
YTTRIUM 90
YTTRIUM ISOTOPES
400103* -- Radiometric & Radiochemical Procedures-- (-1987)
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BISMUTH 214
BISMUTH ISOTOPES
CHERENKOV COUNTING
COUNTING TECHNIQUES
DAYS LIVING RADIOISOTOPES
ELEMENTS
EVEN-EVEN NUCLEI
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
INTERFERING ELEMENTS
INTERMEDIATE MASS NUCLEI
IRON
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIQUID SCINTILLATION DETECTORS
MEASURING INSTRUMENTS
METALS
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-ODD NUCLEI
RADIATION DETECTORS
RADIOISOTOPES
SCINTILLATION COUNTERS
STRONTIUM 90
STRONTIUM ISOTOPES
TRANSITION ELEMENTS
YEARS LIVING RADIOISOTOPES
YTTRIUM 90
YTTRIUM ISOTOPES