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Measured and Predicted Neutron Flux Distributions in a Material Surrounding a Cylindrical Duct

Abstract

The radial fast neutron flux attenuations in the material (iron) surrounding ducts of diameters 7, 9, and 15 cm and total duct length of about 1.5 m have been investigated with and without neutron scattering cans filled with D{sub 2}O in the duct. Experimentally the problem was solved by the use of foil activation techniques. Theoretically it was attacked by, in the first place, a Monte Carlo program specially written for this purpose and utilizing an importance sampling technique. In the second place non- and single-scattering removal flux codes were tried, and also simple hand calculations. The Monte Carlo results accounted well for the fast flux attenuation, while the non- and single-scattering methods overestimated the attenuation generally by a factor of 10 or less. Simple hand calculations using three empirical parameters could be fitted to the measured data within a factor of 1.2 - 1.3 at penetration depths greater than 3 - 4 cm. The distribution of the D{sub 2}O-scattered flux could well be described in terms of single scattering.
Publication Date:
Mar 15, 1966
Product Type:
Technical Report
Report Number:
AE-220
Resource Relation:
Other Information: 13 refs., 19 figs., 1 tab.
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; NEUTRON FLUX; CYLINDRICAL CONFIGURATION; DUCTS; IRON; FAST NEUTRONS; HEAVY WATER; MONTE CARLO METHOD; ATTENUATION
OSTI ID:
20949517
Research Organizations:
AB Atomenergi, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
TRN: SE0708492
Availability:
Commercial reproduction prohibited; OSTI as DE20949517
Submitting Site:
SWDN
Size:
42 pages
Announcement Date:
Dec 17, 2007

Citation Formats

Nilsson, J, and Sandlin, R. Measured and Predicted Neutron Flux Distributions in a Material Surrounding a Cylindrical Duct. Sweden: N. p., 1966. Web.
Nilsson, J, & Sandlin, R. Measured and Predicted Neutron Flux Distributions in a Material Surrounding a Cylindrical Duct. Sweden.
Nilsson, J, and Sandlin, R. 1966. "Measured and Predicted Neutron Flux Distributions in a Material Surrounding a Cylindrical Duct." Sweden.
@misc{etde_20949517,
title = {Measured and Predicted Neutron Flux Distributions in a Material Surrounding a Cylindrical Duct}
author = {Nilsson, J, and Sandlin, R}
abstractNote = {The radial fast neutron flux attenuations in the material (iron) surrounding ducts of diameters 7, 9, and 15 cm and total duct length of about 1.5 m have been investigated with and without neutron scattering cans filled with D{sub 2}O in the duct. Experimentally the problem was solved by the use of foil activation techniques. Theoretically it was attacked by, in the first place, a Monte Carlo program specially written for this purpose and utilizing an importance sampling technique. In the second place non- and single-scattering removal flux codes were tried, and also simple hand calculations. The Monte Carlo results accounted well for the fast flux attenuation, while the non- and single-scattering methods overestimated the attenuation generally by a factor of 10 or less. Simple hand calculations using three empirical parameters could be fitted to the measured data within a factor of 1.2 - 1.3 at penetration depths greater than 3 - 4 cm. The distribution of the D{sub 2}O-scattered flux could well be described in terms of single scattering.}
place = {Sweden}
year = {1966}
month = {Mar}
}