defense and other nuclear probiems, it has also been utilized during nuclear weapons tests and the information obtained is in the classi= fied category. With those readers who have access to this material, the attached list of reports contains these field applications and performance results. The application of the aerial survey technique developed by this Laboratory during nuclear weapons tests is given in the fol= lowing reports. 1. NYOO0=4606 = Performance of HASL Instrumentation During 2. NY00=4618 = Radioactive Debris from Operation CastleAerial Survey of Open Sea Following Yankee= Castle (Secret, RD) Nectar (Secret, Rp) 3. ITR=-1185 = Operation Teapot CETG 30.3 Preliminary Report (Confidential, RD - wmtil reviewed for classification) These reports include data from which the altitude compensation technique was derived, but due to classification they are available to authorized personnel only. ~ 53 «