9. Ca time Interval measurements as well as Bhangmeter. measurements will all be made. For devices fired at Christmas Island on balloons all of the above measurements except for *y would be made. For airdrops if Christmas is not available, only Radchem and Bhangmeter measurements are planned. For the specific case of the XW5O0XIY2, on which neutronflux distribution measurements are required, two possibilities are considered: I) a ground surface shot at Christmas Island with a large vacuum type system and various neutron detectors; 2) the device be fired at about 150 kilometers above Johnston Island with neutron time of flight measurements made by rocket borne instrumentation. As for high altitude shots and development and checking of diagnostic measurements for possible future space testing, x-ray intensity measurements would be made Pee by rockets in space, measurements would be made ina similar manner, and optical measurements would be made from the surface and from aircraft. A 17 November letter to Betts from Bill Ogle of LASL documents the specifics _of the LASL diagnostic program for possible Pacific atmospheric tests as presently planned. Details of diagnostics to be performed from groundborne, airborne and/or shipborne stations for the various types of devices and type of carrier are enumerated. 4

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