Accession Number : ADA192122

Title :   Neutron Field Measurements in Phantom with Foil Activation Methods.

Descriptive Note : Technical rept. 29 Nov 85-29 Nov 86,

Corporate Author : SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA

Personal Author(s) : Verbinski, Victor V ; Cassapakis, Costa G

PDF Url : ADA192122

Report Date : 29 Nov 1986

Pagination or Media Count : 45

Abstract : The threshold neutron-foil spectrometry method, utilizing the SAND II spectrum unfolding code, was evaluated by carrying out a measurement in the standard fission source facility, simultaneous with six (6) in-phantom measurements of neutron spectra. The foil spectrometry was done with the full set of threshold foils, mid-thorax in ER1, where a 2 in. lead wall separated reactor and phantom. A five-foil set was utilized for the phantom mid-head and phantom hip measurements in ER1, as well as for mid-thorax, mid-head and hip in ER2, free field. Calculations of the mid-thorax and mid-head spectra in ER1 and ER2 were carried out, with the source term normalized to nickel foil activations at the reactor entrance window. A simple 5-foil perturbation method for neutron dosimetry, utilizing hand calculations, was developed and evaluated for the ER1 and ER2 spectra. It appears to be the order of 6 percent accurate versus 3-4 percent for SAND II, which utilizes the best (calculated) a prior data available for spectral shape information. Keywords: Dosimetry; Neutron measurements; Radiation effects(humans); Threshold foil.

Descriptors :   *FOILS(MATERIALS), *NEUTRON SPECTRUM, *RADIATION EFFECTS, *THRESHOLD EFFECTS, ACTIVATION, COMPUTATIONS, DOSIMETRY, FACILITIES, FIELD TESTS, FISSION, FREE FIELD, HUMANS, MANUAL OPERATION, MEASUREMENT, NEUTRONS, NICKEL, SHAPE, SOURCES, SPECTRA

Subject Categories : Radiation Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE