“pais (“Avaro) wry 2.19 - Verification of Washdown Effectiveness as a Shipboard Project Radiological Countermeasure - M. M. Bigrers QPIPOTIVes Operation of YAG's and LST to be stationed in fallout area, Rad Safe for NRDL Projects, washdown effectiveness evaluation. Peco Ree AND RESULTS -SUTP OPFRATIONS The Project ships, YAG-32. Y4S-40 and LST-611, successfully com- ‘ | annee ~ (Navajo). Complete information 11 phases of ship and instrumentation operations has been [wey 3 a 4 q’ re) “3 pe f+ "3 Jeted thoir mission on the given te Project 2.63 for inclusion in their reports. YAS~39 Crorations ° oO ms 1 TE5~20'E, arrcroximately 21 miles ? Ky During fallout, the YAG-39 operated within 5 miles of 12°O0'N, the shot locstion, Fallout errive? at O755, % # 2 hours, and the washtown started at 9315. The miximm radiation level recorded on the unwashed fore decks was 1.36 R/br with a second peak of 1.71 R/hr at 1215, The maximm radqiction level aft under the washdown was 242 mr/hr at 11, N # 5 hours. On arrival at Friwetok at about 1439 on 13 July, the combination of rain and decay had reduced radiation levels to 60 mr/hr on the flight deck, 45 mrfhr deck aft. in the unwashed No. 2 Hatch area and 20 mr/hr on the main One day's decontamination by Project 2.9 further reduced the radiation levels and removed most of the loose contamination so that ean Operational clearance was given with the condition that gloves and booties be worn on the forward portion of the ship. DOPIED/DCE J Leni RE, 3 - 4h - Unrestricted access was