4OO5E | WOU~-32-199@ 14:11 FROM “9 anTs-DCEN DOZ HOTRS Ex-di PD pry tAD AF Lp, 4/10/89 NOTE TO JOHN RODOLPH SUBJECT: THE NORTHERN MARSHALLS SURVEY The conduct of an aerial radiological survey at Enewetak Atoll in preparation for cleanup raised the possibility of conducting a similar survey of other locations that could have been impacted by fallout from tests at Bikini and Enewetak Atolls. The purpose of this latter survey would be to collect a body of radiological information to support negotiations for ending the U.S. Trust in the Pacific. What follows is a review of how that survey was planned. <A copy of the RADIOLOGICAL SURVEY PLAN FOR THE NORTHERN MARSHALLS, dated August 22, 1978, is attached. The idea for a radiclogical survey of all islands and atolls that may have been impacted by U.S. nuclear tests in the Marshalls was my own. As this idea developed, there was the problem of how to plan a survey that would cover enough area and atolls to define the region where higher levels of fallout may have occurred, but not so extensive and costly that funding could not be obtained. A plan was developed to conduct a screening survey that would characterize radiological conditions and indicate where any additional radiological measurements should be made. If the aerial radiation data collected during the survey suggested more measurements should be made and this could be accommodated during the survey, this would be done. Otherwise, this data would be used to justify additional surveys at a later time if this was needed. As to how islands and atolls were salected to be included in the survey, this was done on the basis of an inspection of all available reports and data collected during and following nuclear test operations in the Marshalls. Major sources of information were the series of Weapon Test Reports, WT's, classified reports issued for each test series; a compilation ef meteorological data and fallout patterns in DASA 1251, a classified report prepared by the Defense Atomic Support Agency; and reports on the accident with the Bravo test in 1954 issued by Dr. Robert Conard of the Brookhaven National Laboratory. The only dose estimates we found were in Dr. Conard's reports with estimates of acute radiation doses that applied only to the Bravo accident. The WI's and DASA 1251 contained contours of radiation dose rate expressed as r/hr at Htl hour for many tests. All available information was reviewed to determine the most likely areas impacted by ot . fallout from each nuclear test.