last VOV LAG Es: NOV 75 Gan _ -5 1980 EPARTMENT OF DEFENSE D FORCES SPECIAL WEAPONS PROJECT P.O. BOX 2610 WASHINGTON, D.C. ADDRESS REPLY TO: THE CHIEF, ARMEO FORCES BPECIAL WEAPONS PROJECT 25 June 1951 — changed to —— Dr. e as wh om N, . White Commiazsion, Classi U. 8. Atomic Energy w vty ot the P. 0. Box 1663 tes Alamos s New Hexi co Pe alc ae ee laf sification)) in” classi inhor#ing ceinge (Pevms att aE A, n onae e) dat and rze Uae eha sete al Ta (Bignature of pote * e meIram UNCLASSIFIED ; inclosing a copy of the report of external radiation received by personnel on Parry Island as a result of fallout after Shot Item. This material will be contained in the Item Shot report compiled by General Cooney. Similar data is available for the post-—Dog Shot in General Cooney's offical report of Dog Shot addressed to CTG 3,1. This report should be on file with 3.1 at Los Alamos, I do not have an additional copy but have extracted the pertinent data which is hereby included: Extract of Annex A to Dog Shot of CTU 3.1.5: "Decay curves indicated aByPgssible component with_a_7.7 hour half-life, followed by a 1/T!** 1aw. Assuming a 1/TL*2 decay and no loss from leaching the maximum dosage expected can be calculated for future times. Integrated dose to D f# 30 days D # 60 days 2210 or 2705 mur Film badges were given to a group of monitors in Task Unit 3.1.5 with instructions to wear these at all times except when on missions t other islands. These films were developed on D # 3 days and 10 hours. Parry - mean 890 mr ~ range 1,400 to 560 (maximim expected 1,190 mr) Japtan - mean 1,040 mr - range 1,600 to 825 (maximim expe cted 1310 or) The maximum velues for Japtan were estimated from survey meter readings which were about 10% greater than those on Parry Island. No comparable data is available from Eniwetok Island but survey mater readings made early in the fallout showed intensities about two-thirds of those on Parry Island. i Swe Orie Ener” ACt 1946 ~