consists of two pods mounted on a helicopter or light aircraft. contains 20 5" x 2" NaI crystals. Each pod The signals from these detectors are summed and submitted to a data acquisition system, The output is monitored by 8 single channel analyzers and a multichannel analyzer for gamma spectral analysis. whose Also included in the system is an inertial navigation system output is recorded simultaneously with the radiation data on magnetic tape, If the system were mounted on a helicopter travelling at 100 ft/sec, the spatial resolution for 241 on the surface is apvroximately 100 feet when using the single channel mode of operation, High energy gamma enitters mayy be located with a spatial resolution of about 50 feet based upon the t p accuracy of the inertial navigation system. for 60 Co and 131s is about 1 The minimum limits of detection yR/hr and anproximately 1 ci/m® for eb1 Am, The system may also be flown satisfactorily on smell Tixed wing aircraft, but the spatial resolution is directly relnted te airspeed, The total weight of the system is Us:00 lbs and reauires 3 people to operate. It would take aeporoximately 1-3 weens to complese the survey de- pending upon meteorological conditions. he islands may also be taken with a scparate cr Aerial photographs ofo EG&G system which incorporates four Hasselbled lenses, canerus equipped with 80 mm High resolution vhotographs obtaired .ltih this system are a necessity in order to accuretely identify Jecaticns where soil samples and survey meter readings were obtained as well as to assist in assessing the amount of cleanup that will be required. soil Sampling Progr oe” The soil sampling program of the survey will be conducted in a manner that will insure statistically meaningful results. a oO @ 15 em deep cores of 30 one are oD w samples will be collected for enalysis: (1) ; (2) Several types of soil A sampie consisting of two A surface coil sample collected by a “cookie cutter" of 30 on? area to a depth of 5,9 em; and (3) A profile collection besed upon side wall seacplinc in a trench in which complete samples of fixed horizontal arca sre taken to selected depths. The increments of depth sre chosen accordins to oredicted, or known radioisotor. concentration ve, suspected, derth relitionshins and also according to any soil herizens present eat tht sample lecation, WNominal