Analysis of iodine and cesium chemical forms evolved from graphite surfaces at temperatures from 425 to 1400{sup 0}C
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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 712715
- Report Number(s):
- DOE/HTGR-85-069; ORNL/TM-9218; ON: TI85029595
- Resource Relation:
- Other Information: PBD: Aug 1985
- Country of Publication:
- United States
- Language:
- English
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