Open AccessSHIELD SMALL SOURCE EXPERIMENTS. Summary Report
Author(s) -
R. D. Schamberger,
J. Celnik,
R. Ross
Publication year - 1963
Language(s) - English
Resource type - Reports
DOI - 10.2172/4081098
Subject(s) - shield , electromagnetic shielding , monte carlo method , spectrometer , neutron , cross section (physics) , nuclear physics , gamma ray , physics , materials science , computational physics , optics , geology , mathematics , petrology , statistics , quantum mechanics
A shielding experiment was performed that provided a proof test of the shield calculation methods used in the MCR shield desing and provides a partial confirmation of cross-section data. Measurements were made with a gamma spectrometer behind a configuration consisting of a layer of gamma shielding material followed by a neutron shield, with the configuration exposed to neutrons from a Po --Be source. The test configuration is illustrated. Secondary gamma rays produced in the assembly were measured with the spectrometer and compared directly with calculations. Calculations were performed with the ADONIS three- dimensional rectangular geometry Monte Carlo code, which is derived from the one- dimensional Monte Carlo codes used in the basic MCR shield analysis. Experiments were performed with samples of iron, lead, and stainless steel, and calculations were completed for the no-sample configuration and for an iron sample. Experimental and calculated detector response for these two cases are compared. Agreement is within a factor of two at all energies, and the calculated energy deposited in the crystal is within 25% of that observed for the no-sample case and within l5% for the iron case. This agreement demonstrates the validity of the experiment and of the basic calculation techniques used, and gives support to the secondary gamma production cross sections used for iron. (auth