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PSR-0154 GAMIDENT.

GAMIDENT, Aid Identification of Unknown Materials by Gamma-Ray Spectroscopy

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1. NAME OR DESIGNATION OF PROGRAM:  GAMIDENT.
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2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
Program name Package id Status Status date
GAMIDENT PSR-0154/01 Report 21-SEP-1982

Machines used:

No specified machine
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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.
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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.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
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6. TYPICAL RUNNING TIME
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7. UNUSUAL FEATURES
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8. RELATED OR AUXILIARY PROGRAMS
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9. STATUS
Package ID Status date Status
PSR-0154/01 21-SEP-1982 Report Only
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10. REFERENCES
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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11. HARDWARE REQUIREMENTS
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12. PROGRAMMING LANGUAGE(S) USED
No specified programming language
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13. SOFTWARE REQUIREMENTS
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHORS
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16. MATERIAL AVAILABLE
PSR-0154/01
report                   UCRL-50400, Vol.22 Rev 1 (June 25, 1982)   REPPT
report                   UCRL-50400, Vol.22 Rev.2 (May 10, 1983)    REPPT
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17. CATEGORIES
  • O. Experimental Data Processing

Keywords: gamma radiation, spectra.