Results of Calculations of External Gamma Radiation Exposure Rates from Fallout and the Related Radionuclide Compositions Operations Nougat through Bowline, 1962-1968 ABSTRACT This report presents data on calculated gammaradiation exposure rates and ground deposition of related radionuclides resulting from Events that deposited detectable radioactivity outside the Nevada Test Site complex. INTRODUCTION The Events which deposited detectable radioactivity outside the Nevada Test Site complex! are listed in Table. 1. RESULTS Results of the calculations of relative external gamma radiation exposure rate and related radionuclide ground deposition are given in the Appendices. These calculations are described in detail in Ref. 2. The output of the calculation has 30 decay times, 10 from 1 to 21 h, 10 from 1 to 300 d, and 10 from 1 to 50 y. For each of these times and for zero time there are values of the external gammaradiation exposure rate normalized to 1 mR/h, 1 m abovethe surface, 12 h after the event, the associated values of uCi/m? for each radionuclide, and the total wCi/m?. The 733U, 235U, 238U and 25%240Pu data were omitted primarily to keep the output unclassified. Futhermore, the natural uranium contentof the soil is about one million times that received from fallout and at least half of the plutonium in Nevada and Utahsoils comes from worldwide fallout.? TABLE 1. Shot Name Yield, date and placement of Events of Operations Nougat through Bowline, 1962-1968 Yield (kt) Danny Boy Sedan Date 0.43 104 Johnny Boy Placement Mar. 5, 1962 Buried 110 ft July 6, 1962 Buried 635 ft 0.5 July 11, 1962 Buried 2 ft Smail Boy Low July 14, 1962 Low Tower Little Feller } Low July 17, 1962 Surface Sulky 0.092 Dec. 18, 1964 Buried 90 ft Palanquin 4.3 April 14, 1965 Buried 280 ft Cabriolet 2.3 Jan. 26, 1968 Buried 171 ft Buggy 5.4 Mar. 12, 1968 Buried 135 ft Dec. 8, 1968 Buried 355 ft Schooner 30 1