The radiation integrating instruments designed and built by Pel of LASL (Watts) for the T-33A jet fighter proved to be very satisfactory during Tumbler-Snapper. radiation exposures to a results. Wita these instruments it was possible to control = 10 per cent correspondence witn film badge The integrating instruments designed for the F=-84G for use. on Ivy demonstrated a number of minor faults which made them subject to frequent failure. These difficulties are being investigated by Pel and will be corrected by the time the instruments are used on Ivy. The new-type fuel-carrying wing tank filters snowed an improvement in sampling performance over the old type. In several shots these new filter tanks allowed samples to be obtained when conditions were such tnat no samples would nave been obtained with the old units. and F~84G units were satisfactory as filter equipment. Both Te#33A The new=type transport equipment for the filter panels worked well and provided adequate shielding. This equipment can be used without change on Ivy. Studies on the use of protective clothing for crew members exposed to radioactivity are being actively pursued. Calculations are being reviewed on the basis of recent guesses as to relative amounts of highyield radioactive species which will be present in the cloud. PROGRAM 2 PROGRESS OF THE NUCLEAR REACTION - 25 - f. tl