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Title: ADDITIONAL MEASUREMENTS OF THE REACTIVITY TRANSIENT IN IRRADIATED THORIUM

Abstract

Reactivity measurements were made on two pairs of thorium slugs. One pair of Savannah River type slugs was irradiated in MTR in L-58 for an estimated 2.5 x 10/sup 20/ nvt at an estimated flux level of 1.8 x 10/sup 14/ nv. The other pair was Hanford type and was irradiated in A-5 for an estimated 6.6 x 10/ sup 20/ nvt at an estimated level of 2.0 x 10/sup 13/ nv. Estimates of the decay constant of Pa/sup 233/ and the U/sup 23/ >s/sup 3/ content of the slugs were made in the Reactivity Measurement Facility. It is concluded that (1) the long-term reactivity transient is due to Pa/sup 233/ decay, (2) thorium slugs can be irradiated in MTR at flux levels of 10/sup 14/ nv to a U/sup 233/ content of 6 grams without damage to the slugs, and (3) the in-pile cross section of Pa/ sup 233/ can be measured by this method provided an independent measurement of the irradiating flux is made. (D.L.C.)

Authors:
;
Publication Date:
Research Org.:
Phillips Petroleum Co. Atomic Energy Div., Idaho Falls, Idaho
Sponsoring Org.:
US Atomic Energy Commission (AEC)
OSTI Identifier:
4021576
Report Number(s):
IDO-16660
NSA Number:
NSA-15-017545
DOE Contract Number:  
AT(10-1)-205
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-61
Country of Publication:
United States
Language:
English
Subject:
PHYSICS; CROSS SECTIONS; DECAY; IRRADIATION; MTR; NEUTRON FLUX; PROTACTINIUM 233; REACTIVITY; RESEARCH REACTORS; RMF; RODS; THORIUM; TRANSIENTS; URANIUM 233

Citation Formats

Nisle, R G, and Millsap, D A. ADDITIONAL MEASUREMENTS OF THE REACTIVITY TRANSIENT IN IRRADIATED THORIUM. United States: N. p., 1961. Web. doi:10.2172/4021576.
Nisle, R G, & Millsap, D A. ADDITIONAL MEASUREMENTS OF THE REACTIVITY TRANSIENT IN IRRADIATED THORIUM. United States. doi:10.2172/4021576.
Nisle, R G, and Millsap, D A. Mon . "ADDITIONAL MEASUREMENTS OF THE REACTIVITY TRANSIENT IN IRRADIATED THORIUM". United States. doi:10.2172/4021576. https://www.osti.gov/servlets/purl/4021576.
@article{osti_4021576,
title = {ADDITIONAL MEASUREMENTS OF THE REACTIVITY TRANSIENT IN IRRADIATED THORIUM},
author = {Nisle, R G and Millsap, D A},
abstractNote = {Reactivity measurements were made on two pairs of thorium slugs. One pair of Savannah River type slugs was irradiated in MTR in L-58 for an estimated 2.5 x 10/sup 20/ nvt at an estimated flux level of 1.8 x 10/sup 14/ nv. The other pair was Hanford type and was irradiated in A-5 for an estimated 6.6 x 10/ sup 20/ nvt at an estimated level of 2.0 x 10/sup 13/ nv. Estimates of the decay constant of Pa/sup 233/ and the U/sup 23/ >s/sup 3/ content of the slugs were made in the Reactivity Measurement Facility. It is concluded that (1) the long-term reactivity transient is due to Pa/sup 233/ decay, (2) thorium slugs can be irradiated in MTR at flux levels of 10/sup 14/ nv to a U/sup 233/ content of 6 grams without damage to the slugs, and (3) the in-pile cross section of Pa/ sup 233/ can be measured by this method provided an independent measurement of the irradiating flux is made. (D.L.C.)},
doi = {10.2172/4021576},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1961},
month = {3}
}