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Title: Analysis of iodine and cesium chemical forms evolved from graphite surfaces at temperatures from 425 to 1400{sup 0}C

Abstract

Information has been obtained to aid in the identification of the chemical forms of fission product cesium and iodine which are evolved from graphite surfaces heated to temperatures up to 1400{sup 0}C. Iodine and cesium were initially added to the graphite as adsorbed CsI; subsequently, more cesium was added as Cs{sub 2}0 to allow variations of the initial cesium/iodine mol ratio from 1 to 10. The identifications were determined, in part, by inference from the locations of cesium and iodine deposits on a graphite thermal gradient tube, the measured mol ratios of the deposits, and the results of electron surface chemical analyses. Cesium iodide was the most abundant of the chemical forms found; however, significant quantities of cesium-rich oxygen-bearing deposits (probably cesium oxide) and of iodine-rich deposits (mostly molecular I{sub 2}) were also present. The iodine species, CsI and I{sub 2}, were found to move downstream with time and/or gas flow from the hotter to the colder regions of the system. 3 refs., 8 figs., 5 tabs.

Authors:
; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
712715
Report Number(s):
DOE/HTGR-85-069; ORNL/TM-9218
ON: TI85029595
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Aug 1985
Country of Publication:
United States
Language:
English
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; CESIUM; RADIOACTIVITY TRANSPORT; IODINE; HTGR TYPE REACTORS; FUEL PELLETS; FISSION PRODUCT RELEASE; HIGH TEMPERATURE; VERY HIGH TEMPERATURE; GRAPHITE; MODERATORS; TEMPERATURE GRADIENTS; ADSORPTION; TEMPERATURE DEPENDENCE; DEPOSITION; FUEL ELEMENT FAILURE

Citation Formats

Tallent, O K, Wichner, R P, Towns, R L, and Godsey, T T. Analysis of iodine and cesium chemical forms evolved from graphite surfaces at temperatures from 425 to 1400{sup 0}C. United States: N. p., 1985. Web. doi:10.2172/712715.
Tallent, O K, Wichner, R P, Towns, R L, & Godsey, T T. Analysis of iodine and cesium chemical forms evolved from graphite surfaces at temperatures from 425 to 1400{sup 0}C. United States. https://doi.org/10.2172/712715
Tallent, O K, Wichner, R P, Towns, R L, and Godsey, T T. 1985. "Analysis of iodine and cesium chemical forms evolved from graphite surfaces at temperatures from 425 to 1400{sup 0}C". United States. https://doi.org/10.2172/712715. https://www.osti.gov/servlets/purl/712715.
@article{osti_712715,
title = {Analysis of iodine and cesium chemical forms evolved from graphite surfaces at temperatures from 425 to 1400{sup 0}C},
author = {Tallent, O K and Wichner, R P and Towns, R L and Godsey, T T},
abstractNote = {Information has been obtained to aid in the identification of the chemical forms of fission product cesium and iodine which are evolved from graphite surfaces heated to temperatures up to 1400{sup 0}C. Iodine and cesium were initially added to the graphite as adsorbed CsI; subsequently, more cesium was added as Cs{sub 2}0 to allow variations of the initial cesium/iodine mol ratio from 1 to 10. The identifications were determined, in part, by inference from the locations of cesium and iodine deposits on a graphite thermal gradient tube, the measured mol ratios of the deposits, and the results of electron surface chemical analyses. Cesium iodide was the most abundant of the chemical forms found; however, significant quantities of cesium-rich oxygen-bearing deposits (probably cesium oxide) and of iodine-rich deposits (mostly molecular I{sub 2}) were also present. The iodine species, CsI and I{sub 2}, were found to move downstream with time and/or gas flow from the hotter to the colder regions of the system. 3 refs., 8 figs., 5 tabs.},
doi = {10.2172/712715},
url = {https://www.osti.gov/biblio/712715}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Aug 01 00:00:00 EDT 1985},
month = {Thu Aug 01 00:00:00 EDT 1985}
}