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.
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}
}
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}
}