ORNL-1816 - the Molten Salt Energy Technologies Web Site

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ANP QUARTERLY PROGRESS REPORT For much cf the time during the last quarter the Bulk Shielding Facility (BSF) was shut down for modifications to the reactor pool. The modifications were being made to permit the use of demineralized water in the reactor pool in order to eliminate corrosion of the reactor fuel elements. The set of highcpower fuel elements which had iously been operating in process water that had been treated by chromate addition had to be discarded, even though burnup of the uranium in these elements was negligible, because of the extent of pitting of the aluminum cladding. In order to utilize demineralized water, the pool was cleaned and painted, and all steel was either removed or sprayed with a stainless steel pro- tective layer. A bypass demineralizer is being installed to maintain the water purity. The measurement reported below was made by members of the BSF staff in other facilities. A SEARCH FOR SHORT-HALF-LIFE NUCLEAR ISOMERS IN K39, Rb85, Rb8’, AND Zr9’ R. W. Peelle E. C. Campbell F. C. Maienschein Rubidium, potassium, and zirconium are among materials which have been considered as fuel components for reactor systems in which the fuel is circulated. Any short-period isomeric gamma- ray transitions would complicate the shielding of the external fuel loop, especially if the gamma rays were of high energy. Rubidium was previously known to possess a low-energy isomeric transition with a half life of about 1 min, but measurements had not been made which would reveal any shorter period that might be present. Electromagnetically enriched K39, Rb85, and Rb8’ in the form of nitrates were injected into the ORNL Graphite Reactor by use of a fast ’ Part time. 1 56 14. BULK SHIELDING FACILITY F. C. Maienschein G. M. Estabrook E. B. Johnson J. D. Flynn T. A. Love M. P. Haydon’ R. W. Peelle K. M. Henry W. Zobel Physics Division pneumatic probe assembly designed by E. C. Campbell. Since the samples were ejected from the center of the reactor within about 0.1 sec from the end of the bombardment, it was possible to make a search for very short-period activities. The ejected sample was viewed by a thallium- act i voted sodium iodide sc inti I lot ion-cry sta I gamma-ray detector. The signal from the photo- multiplier was transmitted by coaxial cables to a multichannel differential pulse-height analyzer located at the BSF. In addition, the counting rate of any part of the spectrum could be measured as a function of time with a linear count-rate meter and a very fast Brown recorder. Thus both spectral and time decay analyses of gamma radi- ation emitted by the irradiated sample were ob- tainable. A study of K39 yielded no short-period activity. In the rubidium isotopes the previously known radiations were found, but no shorter period isomers were discovered. Isomers with an ap- preciable energy and cross section would‘ have been detected if they had had a half life greater than about 0.03 sec. A sample of Rb85 was found to contain the known 550 k 6-kev transition, with a 1.05 f 0.05-min period, and bombardment of Rb8’ produced the known Rb88 activity. The apparatus described above was also used in the discovery of a number of new isomeric transitions with half periods2 between 0.05 and 5 sec. One of these is Zr90m, which yields a 2.30 f 0.03-Mev gamma ray with a half life of about 0.83 * 0.03 sec. This isomer is produced by inelastic neutron ~cattering.~ 2E. C. Campbell, R. W. Peelle, and F. C. Maienschein, Phys. Semiann. Prog. Rep. Sept. 10, 1954 (unclassified), ORNL-1798, p 36. 3E. C. Campbell, R. W. Peelle, F. C. Maienschein, and P. H. Stelson, Decay and Fast-Neutron Excitation of Zr90m, paper to be presented at the meeting of the American Physical Society, New York, January 1955. 1- * *
In summary, it appears that no previously un- known short-period activi ies which might be of importance in the shielding of circulating-fuel reactors may be induced in K39 or Rb by reactor PERIOD ENDING DECEMBER 10, 7954 neutron bombardment, The newly discovered 2.3- Mev isomeric transition excited by inelastic scattering in Zr9' may be of importance in design considerations for a circulating-fuel reactor. 157
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