The measurement of temperature dependent thermal neutrons in water using a crystal detector
Loading...
Authors
Bennett, Robert Gordon
Subjects
Scintillator
Phosphor
LiI(Eu) crystal
Temperature-dependent flux
Light-pipe
Flux-mapping
Phosphor
LiI(Eu) crystal
Temperature-dependent flux
Light-pipe
Flux-mapping
Advisors
Nguyen, D.
Date of Issue
1970-12
Date
December 1970
Publisher
Monterey, California; Naval Postgraduate School
Language
en_US
Abstract
This research was concerned with the temperature dependence of thermal neutron flux. In view of the excellent neutron detection capability exhibited by the Lithium Iodide Europium crystal this phosphor was utilized for the investigation. A miniature crystal (4 mm X 4 mm) and a flexible light pipe combination were used to determine the neutron spatial distribution as a function of temperature using a Pu-Be source in a light-water medium. A separate experimental investigation, with Indium foils and activation analysis, was used to determine the temperature dependence of thermal neutron flux under the same experimental conditions as the crystal. A theoretical analysis was also conducted using Two-Group theory to obtain an expression for thermal flux with spatial and temperature dependent parameters. The results of the research indicates that the thermal neutron flux is temperature dependent in the region of temperature investigated (77 degrees - 168 degrees F). The experimental results verify the increasing trend of flux magnitude with increasing temperature, as predicted by the Two-Group solution.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.