2002 Edition, February 10, 2002
Standard Practice for NaI(Tl) Gamma-Ray Spectrometry of Water
Includes all amendments and changes through Reapproval Notice , 2009
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Description / Abstract:
This practice covers the measurement of radionuclides in water
by means of gamma-ray spectrometry. It is applicable to nuclides
emitting gamma-rays with energies greater than 50 keV. For typical
counting systems and sample types, activity levels of about 40 Bq
(1080 pCi) are easily measured and sensitivities of about 0.4 Bq
(11 pCi) are found for many nuclides
(1-10).2 Count rates in excess of 2000
counts per second should be avoided because of electronic
limitations. High count rate samples can be accommodated by
dilution or by increasing the sample to detector distance.