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Nuclear News 40 Under 40 discuss the future of nuclear
Seven members of the inaugural Nuclear News 40 Under 40 came together on March 4 to discuss the current state of nuclear energy and what the future might hold for science, industry, and the public in terms of nuclear development.
To hear more insights from this talented group of young professionals, watch the “40 Under 40 Roundtable: Perspectives from Nuclear’s Rising Stars” on the ANS website.
G. E. Plummer
Nuclear Science and Engineering | Volume 31 | Number 2 | February 1968 | Pages 183-190
Technical Paper | doi.org/10.13182/NSE68-A18230
Articles are hosted by Taylor and Francis Online.
This experiment was designed to test the barrier and geometry attenuation factors for 60Co gamma rays developed from moments-method calculations by Spencer as given in National Bureau of Standards Monograph 42. A set of vertical, plane steel barriers was employed. Selection of the detector distance from a given barrier and the degree of collimation permitted exposures to be measured as a function of the solid angle subtended by a constant circular area on the barrier. The effective mass thickness of the barriers ranged from 0 to 73 lb/ft2 and the solid angle subtended at the detector varied from 0.2 to 5.5 sr. A uniform plane radiation field was simulated by a traveling 60Co source that was pumped through plastic tubing that covered a 100-ft semicircular area. Extrapolation of the experimental data gave estimates of the exposures to be expected from an infinitely extended field. The final results for a collimated detector, located behind a steel barrier, were normalized to the free-field exposure received by a detector located 3 ft above the extended field. The experimental values were compared to a family of curves based on calculated results. For all cases except those for relatively small solid angles, the agreement was within 20%.