PHOTONUCLEAR ACTIVATION BY 20 MEV GAMMA RAYS. Technical Report No. 9
Technical Report
·
OSTI ID:4817345
The photonuclear activation cross section of elements whose ( gamma ,n) reaction leads to a suitable positron activity was measured using monochromatic gamma rays from a large sodium iodide crystal 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. diameter by 2 in. long NaI crystals set on the annihilation radiation photopeaks. This detector was calibrated against a Fi/sup 18/ positron source, standardized in a 2 pi flow counter. The investigated over the energy range from 20.l to 2l.2 Mev. Structure, although reported by other experimenters, was not observed. The ( gamma ,n) activation cross section was measured at 20.5 Mev for Cr/sup 50/, Fe/ sup 54/, Cu/sup 63/, Zn/sup 64/, Mo/sup 92/, Sb/sup 121/, Pr/sup 141/, and the results compared with those obtained with betatron experiments. (auth)
- Research Organization:
- Pennsylvania. Univ., Philadelphia
- NSA Number:
- NSA-16-004755
- OSTI ID:
- 4817345
- Report Number(s):
- TID-13492
- Country of Publication:
- United States
- Language:
- English
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