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Title: EFFICIENCIES AND PHOTOFRACTIONS FOR GAMMA RADIATION ON SODIUM IODIDE (THALLIUM ACTIVATED) CRYSTALS

Abstract

The efficiencies and photofractions for monoenergetic garnma raps incident on sodium iodide (thallium activated) crystals have heen calculated by the Monte Carlo method. The calculations have been carried out for broad parallel-beam sources, point sources on the crystal axis, and disk sources, all for photon energies of 0.279, 0.861, 1.33, 2.82, and 4.45 Mev. The crystals considered were right circular cylinders with radii of radius, heights of 1.0, 2.0, 4.0, and 8.0 inches. The effect of the escape of annihilation gammas from the crystal was taken into account in the Monte Carlo calculation; however, no correction was made for escape of bremsstrahlung from secondary electrons and positrons. This latter correction is of importance only at the largest energies and for the smallest crystals where it affects the photofractions by a few per cent. (auth)

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab., Lemont, Ill.
OSTI Identifier:
4294217
Report Number(s):
ANL-5902
NSA Number:
NSA-12-017497
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-58
Country of Publication:
United States
Language:
English
Subject:
PHYSICS; ANNIHILATION; BREMSSTRAHLUNG; CONFIGURATION; CRYSTALS; EFFICIENCY; ELECTRONS; ENERGY; ERRORS; GAMMA RADIATION; IMPURITIES; MONTE CARLO METHOD; POSITRONS; RADIATION SOURCES; SODIUM IODIDES; THALLIUM

Citation Formats

Miller, W.F., Reynolds, J., and Snow, W.J. EFFICIENCIES AND PHOTOFRACTIONS FOR GAMMA RADIATION ON SODIUM IODIDE (THALLIUM ACTIVATED) CRYSTALS. United States: N. p., 1958. Web. doi:10.2172/4294217.
Miller, W.F., Reynolds, J., & Snow, W.J. EFFICIENCIES AND PHOTOFRACTIONS FOR GAMMA RADIATION ON SODIUM IODIDE (THALLIUM ACTIVATED) CRYSTALS. United States. doi:10.2172/4294217.
Miller, W.F., Reynolds, J., and Snow, W.J. Fri . "EFFICIENCIES AND PHOTOFRACTIONS FOR GAMMA RADIATION ON SODIUM IODIDE (THALLIUM ACTIVATED) CRYSTALS". United States. doi:10.2172/4294217. https://www.osti.gov/servlets/purl/4294217.
@article{osti_4294217,
title = {EFFICIENCIES AND PHOTOFRACTIONS FOR GAMMA RADIATION ON SODIUM IODIDE (THALLIUM ACTIVATED) CRYSTALS},
author = {Miller, W.F. and Reynolds, J. and Snow, W.J.},
abstractNote = {The efficiencies and photofractions for monoenergetic garnma raps incident on sodium iodide (thallium activated) crystals have heen calculated by the Monte Carlo method. The calculations have been carried out for broad parallel-beam sources, point sources on the crystal axis, and disk sources, all for photon energies of 0.279, 0.861, 1.33, 2.82, and 4.45 Mev. The crystals considered were right circular cylinders with radii of radius, heights of 1.0, 2.0, 4.0, and 8.0 inches. The effect of the escape of annihilation gammas from the crystal was taken into account in the Monte Carlo calculation; however, no correction was made for escape of bremsstrahlung from secondary electrons and positrons. This latter correction is of importance only at the largest energies and for the smallest crystals where it affects the photofractions by a few per cent. (auth)},
doi = {10.2172/4294217},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1958},
month = {8}
}