SYMPOSIA PAPER Published: 01 January 1994

The Modified Notched Neutron Spectrum Technique for the Surveillance of Hydrogen in Reactor Materials


The determination of hydrogen content in power reactor materials is a component of an overall surveillance program. Unfortunately, techniques that accurately and nondestructively measure hydrogen content at parts-per-million (ppm) levels have not previously been available. One possible hydrogen measuring technique is based upon the “notched neutron spectrum technique” that has been implemented by EG&G Idaho to characterize hydrogen content in reactor materials for the U.S. Navy. Modifications to this technique have already been demonstrated that increase its sensitivity and utility, allowing for a current accuracy of 0.4 micrograms of hydrogen per gram of steel or an equivalent weight of 6 micrograms in a typical steel sample. This paper describes further tests that have increased the dynamic range of these measurements and provided verification of the absolute calibration of the method.

Author Information

Miller, WH
Nuclear Engineering Program, University of Missouri, Columbia, MO
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Developed by Committee: E10
Pages: 271–279
DOI: 10.1520/STP15120S
ISBN-EB: 978-0-8031-5281-6
ISBN-13: 978-0-8031-1899-7