oe OI d F D = 2,32 x 10°t72+ (1.1) Average dose rate, r/hbr. Time after detonation, minutes. Consideration of Reference 2 led to the following gensralizations which were used as guides in the initial planning of this project: The dose rate in the cloud is relatively independant of yield. (2) (1) Within a factor of two, the average dose rate in a cloud is given by Equation ll. The first manned penetrations at early times after detonation (17 to 41 minutes) were nade during Operation TEAPOT, These penetrations were made through clouds from weapons ranging in yield. The average dose rate in the cloud as masured during these penetrations is shown grapbically in Figure 3.2. The gamma radiation dose rate within the atomic cloud resulting from klloton-range weapons has received theoretical consideration in Refer- ences 3, 4, 5, 6, and 7. The outstanding features of many of these cal- culations are the very-high gamma dose rates predicted for very-early times due to small cloud size and high fission=product concentration. BEST AVAILABLE COPY.