Neutron beam design for low-intensity neutron and gamma-ray radioscopy using small neutron sources

Compact accelerator-driven neutron sources allow to operate multiple optimised target-moderator-reflector (TMR) units adapted to the requirements of the respective instruments. The compact design of the TMR units allows an efficient coupling of neutron production, neutron moderation and extraction, but requires a novel way of optimisation. The neutronic performance of different TMR units based on polyethylene, heavy water and a mixture of heavy and light water moderators together with Pb and Be reflectors and a borated polyethylene absorber is discussed. Extraction channels for thermal and cold neutrons are investigated regarding the energy and time spectra.

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A NEW GAMMA TRANSITION FOLLOWING THE DECAY OF 2.4-MINUTE 108AG

Canadian Journal of Physics ◽

10.1139/p64-200 ◽

1964 ◽

Vol 42 (11) ◽

pp. 2173-2179 ◽

Cited By ~ 3

Author(s):

H. W. Taylor ◽

T. A. Eastwood

Keyword(s):

Decay Time ◽

Gamma Ray ◽

Gamma Transition ◽

Full Energy Peak ◽

Full Energy ◽

Low Intensity ◽

Energy Peak ◽

Gamma Coincidence

A low-intensity peak has been found at 1010 ± 30 keV in the gamma-ray spectrum of 2.4-minute 108Ag obtained with NaI scintillation spectrometers. Consideration of the source-to-crystal distance as well as the effects of absorbers and decay time shows that it is the full-energy peak of a 1010 ± 30 keV gamma ray emitted by 108Ag. Gamma–gamma coincidence studies indicate that this gamma transition occurs between a new level at 1433 ± 30 and the 433-keV level of 108Pd.

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GEANT4 used for neutron beam design of a neutron imaging facility at TRIGA reactor in Morocco

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/j.nima.2011.02.096 ◽

2011 ◽

Vol 651 (1) ◽

pp. 21-27 ◽

Cited By ~ 3

Author(s):

A. Ouardi ◽

A. Machmach ◽

R. Alami ◽

A. Bensitel ◽

A. Hommada

Keyword(s):

Neutron Beam ◽

Neutron Imaging ◽

Triga Reactor ◽

Beam Design

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Epithermal Neutron Beam Design for Neutron Capture Therapy at the Power Burst Facility and the Brookhaven Medical Research Reactor

Nuclear Technology ◽

10.13182/nt90-a34490 ◽

1990 ◽

Vol 92 (1) ◽

pp. 106-117 ◽

Cited By ~ 24

Author(s):

Floyd J. Wheeler ◽

D. Kent Parsons ◽

Brian L. Rushton ◽

David W. Nigg

Keyword(s):

Medical Research ◽

Neutron Beam ◽

Neutron Capture ◽

Epithermal Neutron ◽

Research Reactor ◽

Neutron Capture Therapy ◽

Beam Design

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Gamma Ray Attenuation Coefficient Measurement in Energies 1172 keV and 1332 keV for Neutron Absorbent Saturated Solutions

Volume 5: Safety and Security; Low Level Waste Management, Decontamination and Decommissioning; Nuclear Industry Forum ◽

10.1115/icone14-89090 ◽

2006 ◽

Author(s):

Majid Jalali

Keyword(s):

Attenuation Coefficient ◽

Gamma Rays ◽

Gamma Ray ◽

Neutron Absorption ◽

Attenuation Coefficients ◽

Neutron Sources ◽

Coefficient Measurement ◽

Gamma Ray Attenuation ◽

Mass Attenuation Coefficients ◽

Saturated Solutions

The compounds, Na2B4O7, H3BO3, CdCl2 and NaCl and their solutions, attenuate gamma rays in addition to neutron absorption. These compounds are widely used in shielding of neutron sources, reactor control and neutron converters. Mass attenuation coefficients of gamma related to saturated solutions of the above four compounds, in energies 1172 keV and 1332 keV have been measured by NaI detector and agree very well with the results obtained by Xcom code. Experiment and computation show that, H3BO3 has the highest gamma ray attenuation coefficient among the aforementioned compounds.

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