Gamma-ray spectrum catalogue: a user data file Page: 3 of 14
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a sealed gas sample, measured 8 minutes after collection. These composite
spectra are valuable in determining possible interferences in the analysis
of complex spectra of gross fission product nuclides.
The large volume of data obtained from this experimental effort is
utilized in many ways. It provides a base for the generation of files of
gamma-ray energies and intensities for automated analysis of gamma-ray
spectra. Present plans are to include it in the input to the data bank of
the Nuclear Data Group at the Oak Ridge National Laboratory and to provide
sorted output of selected data in magnetic tape format for general user
applications. It is presently intended that the effort will continue to
obtain data on additional nuclides and to improve the precision of energy
and intensity measurements on nuclides presently in the file. It is felt
that this approach to the measurement and compilation of selected types of
nuclear data represents an appropriate method of obtaining specialized data
sets for particular applications. It is essential that user acceptance of
these data be the indicator for justification of continued or expanded
effort in base technology for experimental nuclear gamma-ray spectrometry.
2. EXPERIMENTAL MEASUREMENTS
In the development of experimental techniques for the use of NaI
scintillation spectrometers, the concept of a standard detector and experi-
mental source-detector geometry was developed. The 3-in. diameter x 3-in.
cylindrical NaI(T1) detector was adopted in a standard geometry and the
detector response characterized with considerable precision. With a known
sensitive volume and standard geometry it was possible to achieve a labora-
tory standard spectrometer which has been adopted in many laboratories
throughout the world. Unfortunately the 3-in. x 3-in. semiconductor radia-
tion detector has eluded us to the present and the state-of-the-art has not
made it possible to produce detectors with precisely defined sensitive
volume. Over the past 6 or 7 years we have steadily progressed through small
volume planar devices of 1 or 2 cm3 volume to high-quality coaxial-drift
detectors with sensitive volumes approaching 100 cm3. For this reason and
other factors related to the performance of low-noise electronics required
to achieve good energy resolution, it has not been practical to consider a
standard semiconductor laboratory spectrometer concept. Since the data con-
tained in the present data file have been collected from early in 1966 to
the present time, a variety of high-quality spectrometer systems have been
used in these experimental measurements. The characteristics of the detec-
tors used are presented in Table I. During this period considerable effort
has been expended at this and other laboratories in the development and
refinement of electronics to utilize the energy resolution afforded by semi-
conductor detectors and to develop techniques for the analysis of pulse-
height data to obtain precision values for the energies and intensities of
gamma rays. The experimental techniques developed at this laboratory have
been described in the literature [3,4,5].
All data in the Catalogue were obtained using spectrometer systems which
have been carefully calibrated to establish electronic system linearity and
stability using both computer-controlled pulse generators  and multiple
source techniques. All energy and intensity measurements are made using
techniques developed at this laboratory and described in recent publica-
tions [7J. The analysis of all data to obtain energies and intensities
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Heath, R.L. Gamma-ray spectrum catalogue: a user data file, article, October 31, 1973; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc1032361/m1/3/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.