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On the Attenuation of Neutrons and Photons in a Duct Filled with a Helical Plug

Abstract

Neutron and gamma ray attenuation has been studied in a cylindrical duct, length/diam. ratio 7, partly (36 vol.%) filled by a helical (screw-like) plug with adjustable number of turns. The total neutron leakage through the duct decreased by a factor of six from zero to 0.5 turn, and by an additional factor of three from 0.5 to 2 turns (saturation value). The leakage with less than 0.5 turn is governed by fast flux and above 0.5 turn by epithermal flux. It is observed that the attenuation calculation in a homogenized, infinite material combined with the predicted attenuation in a duct give the measured saturation attenuation. The length coordinates used must be slightly modified in this case. The attenuation of gamma in the saturation case (3 turns) equals that predicted without the duct attenuation in a homogenized infinite material.
Authors:
Publication Date:
Dec 15, 1966
Product Type:
Technical Report
Report Number:
AE-261
Resource Relation:
Other Information: 6 refs., 10 figs.
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ATTENUATION; NEUTRONS; PHOTONS; DUCTS; PLUGGING; GAMMA RADIATION
OSTI ID:
20949462
Research Organizations:
AB Atomenergi, Nykoeping (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
TRN: SE0708445
Availability:
Commercial reproduction prohibited; OSTI as DE20949462
Submitting Site:
SWDN
Size:
28 pages
Announcement Date:
Dec 15, 2007

Citation Formats

Aalto, E, and Krell, Aa. On the Attenuation of Neutrons and Photons in a Duct Filled with a Helical Plug. Sweden: N. p., 1966. Web.
Aalto, E, & Krell, Aa. On the Attenuation of Neutrons and Photons in a Duct Filled with a Helical Plug. Sweden.
Aalto, E, and Krell, Aa. 1966. "On the Attenuation of Neutrons and Photons in a Duct Filled with a Helical Plug." Sweden.
@misc{etde_20949462,
title = {On the Attenuation of Neutrons and Photons in a Duct Filled with a Helical Plug}
author = {Aalto, E, and Krell, Aa}
abstractNote = {Neutron and gamma ray attenuation has been studied in a cylindrical duct, length/diam. ratio 7, partly (36 vol.%) filled by a helical (screw-like) plug with adjustable number of turns. The total neutron leakage through the duct decreased by a factor of six from zero to 0.5 turn, and by an additional factor of three from 0.5 to 2 turns (saturation value). The leakage with less than 0.5 turn is governed by fast flux and above 0.5 turn by epithermal flux. It is observed that the attenuation calculation in a homogenized, infinite material combined with the predicted attenuation in a duct give the measured saturation attenuation. The length coordinates used must be slightly modified in this case. The attenuation of gamma in the saturation case (3 turns) equals that predicted without the duct attenuation in a homogenized infinite material.}
place = {Sweden}
year = {1966}
month = {Dec}
}