This report is published in the interest of providing information which may prove of value to the reader in his study of effects data derived principally from nuclear weapons tests and from experiments designed to duplicate various characteristics of nuclear weapons. This document is based on information available at the time of preparation which may have subsequently been expanded and re-evaluated. Also, in preparing this report for publication, some classified material may have been removed. Users are cautioned to avoid interpretations and conclusions based on unknown or incomplete data. LEGAL NOTICE This report was prepared as an account of Government sponsored work. Neither the United States, nor the Commission, nor any person acting on behalf of the Commission: A. Makes any warranty or representation, expressed or Implied, with respect to the accu racy, completeness, or usefulness of the information contained In this report, or that the use of any information, apparatus, method, or process disclosed in this report may not infringe privately owned rights; or B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of any information, apparatus, method, or process disclosed in this report. As used in the above, *'person acting on behalf of the Commission" includes any em ployee or contractor of the Commission, or employee of such contractor, to the extent that such employee or contractor .of the Commission, or employee of such contractor prepares, disseminates, or provides access to, any information pursuant to Ms employment or contract with the Commission, or his employment with such contractor.

A combination of a disc and a ring source of appropriate radii can be used to produce gamma-ray energy and angle distributions equivalent to those above an infinite plane, thus avoiding the "far-out" correction usually required for shielding experiments performed in a. simulated fallout field. Examination of angle distribution data measured 3 ft above plane 6oC'o sources led to this concept. Monte Carlo calculations of both the energy and the angle distributions 3 ft and 40 ft above disc, ring, and infinite plane sources substantiate this concept. The degree of simulation is somewhat insensitive to the exact radius of the ring source; large deviations in ring source radii can be tolerated without severe penalty in some shielding studies.

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This report is published in the interest of providing information which may prove of value to the reader in his study of effects data derived principally from nuclear weapons tests and from experiments designed to duplicate various characteristics of nuclear weapons. This document is based on information available at the time of preparation which may have subsequently been expanded and re-evaluated. Also, in preparing this report for publication, some classified material may have been removed. Users are cautioned to avoid interpretations and conclusions based on unknown or incomplete data. LEGAL NOTICE This report was prepared as an account of Government sponsored work. Neither Uie United States, nor the Commission, nor any person acting on behalf of the Commission: A. Makes any warranty or representation, expressed or implied, with respect to the accuracy, completeness, or usefulness of the information contained in this report, or that the use of any information, apparatus, method, or process disclosed in tWs report may not infringe privately owned rights; or B. Assumes any liabilities with respect to the use of, or for damages resulting from the use of any information, apparatus, method, or process disclosed in this report. As used in the above, "person acting on behalf of the Commission" includes any employee or contractor of the Commission, or employee of such contractor, to the extent that such employee or contractor of the Commission, or employee of such contractor prepares, disseminates, or provides access to, any information pursuant to his employment or contract with the Commission, or his employment with such contractor.

This report is published in the interest of providing information which may prove of value to the reader in his study of effectsdata derived principallyfrom nuclear weapons tests and from experiments designed to duplicate various characteristics of nuclear weapons. This document is based on information available a t the time of preparation which may have subsequently been expanded and re-evaluated. Also, in preparing this report for publication, some classified material may have been removed. Users are cautioned to avoid interpretations and conclusions based on unknown or incomplete data.