Accession Number:

AD0261124

Title:

PHOTONUCLEAR ACTIVATION BY 20 MEV GAMMA RAYS

Descriptive Note:

Corporate Author:

PENNSYLVANIA UNIV PHILADELPHIA

Personal Author(s):

Report Date:

1961-01-01

Pagination or Media Count:

1.0

Abstract:

The photonuclear activation cross section of elements whose gamma, n reaction leads to a suitable positron activity was measured using monochromatic gamma rays from H-3p, gammaHe-4 reaction. The gamma rays were monitored by a large sodium io ide cr stal whose response curve to the gamma rays was measured. The absorption coefficient of these photons in NaI was determined by a good geometry transmission experiment. The positron activity was determined by a coincidence detector, consisting of two 5-in.-diam by 2-in.long NaI crystals set on the annihilation radiation photopeaks. This detector was calibrated against a F-18 positron source, standardized in a 2 pi flow counter. The C-12gamma, nC-11 and F-19g activation cross section was measured at 20.5 Mev for Cr-50, Fe-54, Cu-63, Zn-64, Mo-92, Sb-121, Pr-141, and the results compared with those obtained with betatron experiments. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE