PSR-0154 GAMIDENT.
GAMIDENT, Aid Identification of Unknown Materials by Gamma-Ray Spectroscopy
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHODS, RESTRICTIONS, CPU, FEATURES, AUXILIARIES, STATUS, REFERENCES, REQUIREMENTS, LANGUAGE, OPERATING SYSTEM, OTHER RESTRICTIONS, AUTHOR, MATERIAL, CATEGORIES
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| GAMIDENT | PSR-0154/01 | Report | 21-SEP-1982 |
Machines used:
No item found
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3. DESCRIPTION OF PROGRAM OR FUNCTION
The gamma rays emitted by an isotope undergoing radioactive decay or neutron capture have energies and intensities that are characteristic of that isotope. Such a set of gamma rays is often referred to as the signature of the isotope. A useful method for the nondestructive assay of unknown materials is based on identifying the signature of the isotope. There are thousands of known gamma rays, therefore an automated search procedure was developed. GAMIDEN is designed to help identify isotopes by their gamma-ray emissions and thus to assist in the nondestructive assay of unknown materials. From both radioactive decays and neutron captures, GAMIDEN searches GAMTOT78, a file of gamma-ray spectra, for matches with observed photon energies.
The gamma rays emitted by an isotope undergoing radioactive decay or neutron capture have energies and intensities that are characteristic of that isotope. Such a set of gamma rays is often referred to as the signature of the isotope. A useful method for the nondestructive assay of unknown materials is based on identifying the signature of the isotope. There are thousands of known gamma rays, therefore an automated search procedure was developed. GAMIDEN is designed to help identify isotopes by their gamma-ray emissions and thus to assist in the nondestructive assay of unknown materials. From both radioactive decays and neutron captures, GAMIDEN searches GAMTOT78, a file of gamma-ray spectra, for matches with observed photon energies.
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4. METHODS
GAMIDEN, a computer code, searches GAMTOT78, a file of gamma-ray spectra, for isotopes that match observed gamma energies. GAMIDEN lists the matching isotopes, eliminates isotopes that are not likely to be the source of the observed photons, and then lists the isotopes that are left-the likely candidates. The user makes any further analysis required to identify the actual source isotopes. The search procedure used in GAMIDEN is outlined as follows:
a- Given a set of observed photon energies, search the tabulated data for photons with the same energies, within experimental uncertainty. Isotopes that emit such photons form the initial list of possible sources of the observed photons.
b- Examine the tabulated spectrum of each isotope for gammas that have a higher probability of emission than the observed gamma has; presumably, such gammas should have been observed as well.
c- Examine energies of the other observed photons to see if these higher-probability gammas, if any, were, in fact, observed.
d- If the matching isotope's spectrum contains a higher-probability gamma and it was not observed, remove this isotope from the list of possible sources. Isotopes that survive this test constitute the final list of possible sources.
GAMIDEN, a computer code, searches GAMTOT78, a file of gamma-ray spectra, for isotopes that match observed gamma energies. GAMIDEN lists the matching isotopes, eliminates isotopes that are not likely to be the source of the observed photons, and then lists the isotopes that are left-the likely candidates. The user makes any further analysis required to identify the actual source isotopes. The search procedure used in GAMIDEN is outlined as follows:
a- Given a set of observed photon energies, search the tabulated data for photons with the same energies, within experimental uncertainty. Isotopes that emit such photons form the initial list of possible sources of the observed photons.
b- Examine the tabulated spectrum of each isotope for gammas that have a higher probability of emission than the observed gamma has; presumably, such gammas should have been observed as well.
c- Examine energies of the other observed photons to see if these higher-probability gammas, if any, were, in fact, observed.
d- If the matching isotope's spectrum contains a higher-probability gamma and it was not observed, remove this isotope from the list of possible sources. Isotopes that survive this test constitute the final list of possible sources.
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PSR-0154/01, included references:
- R.J. Howerton:GAMIDEN: A Program to Aid in the Identification of Unknown
Materials by Gamma-Ray Spectroscopy
UCRL-50400, Vol.22 Rev.1 (June 25, 1982)
- R.J. Howerton:
GAMIDEN: A Program to Aid in the Identification of Unknown
Materials by Gamma-Ray Spectroscopy.
UCRL-50400, Vol.22 Rev.2 (May 10, 1983)
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PSR-0154/01
report UCRL-50400, Vol.22 Rev 1 (June 25, 1982) REPPTreport UCRL-50400, Vol.22 Rev.2 (May 10, 1983) REPPT
Keywords: gamma radiation, spectra.