Accession Number : AD0281758

Title :   AN INITIAL GAMMA-RAY SPECTROGRAPH,

Descriptive Note : Rept. for Jan 59-Apr 61,

Corporate Author : ARMY NUCLEAR DEFENSE LAB EDGEWOOD ARSENAL MD

Personal Author(s) : Van Antwerp,W. R.

Report Date : FEB 1962

Pagination or Media Count : 104

Abstract : The feasibility of an initial gamma-ray spectrograph has been investigated. An instrument based on the magnetic analysis of Compton electrons is presented as having suitable attributes for use in the laboratory or in the field and for the measurement of gamma spectra from weapons or pulsed reactors. The instrument is designed for an energy range from 1 to 12 Mev and may be useable over the range from 0.25 to 25 Mev. Use of the natural focal properties of uncollimated Compton electrons in a semicircular beta-ray spectrograph is proposed, and theoretical and experimental results are presented on the performance of such an instrument. The resolution that can be obtained is approximately 40 kev, the instrument can be used at arbitrarily high rates, and the sensitivity is very low. In a typical situation 10 to the 15th power gamma rays might be just detectable. (Author)

Descriptors :   *COMPTON SCATTERING, *GAMMA RAY SPECTRA, BETA RAY SPECTROSCOPY, ELECTRONS, GAMMA RAY SPECTROSCOPY, INSTRUMENTATION, MAGNETIC PROPERTIES, PULSE ANALYZERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE