Title:
The Detection
of Hydrogen in Metals Using Neutron Interactions
Author : Mohamed Hatem Hashem
Collection : Ph.D. Nuclear
Abstract:
Water is universally present and so
is hydrogen. Because of its small atomic size the hydrogen atom can relatively
easily diffuse into a host metal and although the metal may appear fine for a
while, it will suddenly lose its strength and ductility. Thus, measuring
hydrogen content in metals is important in many fields of the nuclear industry
to automobiles and aircraft fabrication especially in the offshore oil and gas
fields. Nuclear methods for measuring the content of hydrogen in metals have
been proven to achieve sensitivity levels of the order of parts per million. By
rising the industrial progress toward the employment of computer in order to
model the tangible problems by using special software in this field. One such
computational software for radiation transport modeling is the Monte Carlo
N-Particle (MCNP) radiation transport code. However, no comprehensive document
has been written to introduce the use of the MCNP code for simulating the
hydrogen concentration in metal problem. This document, a primer, addresses the
need of using a neutron source to monitor the hydrogen concentration in the
metal in-situ through the basic use of MCNP and its particular application.
This is by model an example, the hydrogen atom is distributed along the grain
boundaries in steel. The aim that from the example is illustrating the hydrogen
concentration relative to neutron counts in the designed setup. These examples
along with the instructions for reproducing them are the results of this thesis
research.
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