Copier. It is concluded that the 2x counter described is suitable for counting large area sources up to 4 inches in diameter and can be adapted to kx counting. CWLR - 2272 - SURVIVAL IN FALLOUT AREAS (U). Harold E. Shaw, Captain, CmlC, February 1959. UNCLASSIFIED This report attempts to summarize, amplify and clarify the current information available through participation in nuclear events and subsequent evaluation of the data obtained. The report consists of four sections: 1. <A nontechnical summation of information on the characteristics and method of formation of radioactive fallout. 2. <A brief resume of the biological effects of fallout. 3. A discussion of the basic principles involved in the reduction of the hazards of radiologica@l fallout and the application of these principles. 4, <A summary of calculations useful in the evaluation of the fallout hazard. €s CWLR - 2282 - AN ACTIVATION-TYPE NEUTRON DETECTION SYSTEM AND ITS CALIBRATION (U). J. W. Kinch and D. L. Rigotti, July 1959. CONFIDENTIAL - Formerly Restricted Data This report describes a method for measuring neutron flux and obtaining an indication of the neutron energy spectrum. The conversion of the flux and spectrum information to neutron dose is briefly discussed. Some materials in which radioactive isotopes are produced as the result of neutron-induced nuclear reactions can be used to measure neutron flux and are called activation detectors. Activation detectors whose reaction cross section precludes the formation of a radioactive product with neutrons other than those with energies greater than a certain value are called threshold detectors. report are: qn The neutron achavation detectors described in this Aut97, pu239, Npe37, ye3 ’ s3¢ ana 2r%®, The calibration of these detectors is accomplished by the evaluation of a constant which accounts for counting geometry, cross