ASTM D 4962 Standard Practice for NaI(TI) Gamma-Ray Spectrometry of Water
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ASTM D 4962 Document Information:
Title
Standard Practice for NaI(TI) Gamma-Ray Spectrometry of Water
ASTM International
Publication Date:
Feb 10, 2002
Scope:
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). 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.
This practice can be used for either quantitative or relative
determinations. In tracer work, the
results may be expressed by comparison with an initial concentration
of a given nuclide which is
taken as 100 %. For radioassay, the results may be expressed in terms
of known nuclidic standards
for the radionuclides known to be present. In addition to the
quantitative measurement of gamma-ray
activity, gamma-ray spectrometry can be used for the identification of
specific gamma-ray emitters
in a mixture of radionuclides. General information on radioactivity
and the measurement of
radiation has been published (11 and 12). Information on specific
application of gamma-ray
spectrometry is also available in the literature (13-16).
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- gamma pulse height analysis
- gamma ray spectrometry
- multichannel analyzer
- sodium iodide detector
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