"wh AY Brow) Project 22.1 - Measurement of Alpha and Boost - L. F. Wouters EXPERIMENTAL The gamma rays produced by the sucleer reaction were detected by fluor-photocell detectors locate? in a lead lined “doghouse” 890 feet from the sero point. A 27 foot lead pipe served to collimate the game rays onto an array of four fluors, The four fluors vere positioned in tandes along the gamma path and vere observe’ by « total of three photodiodes and four photomultiplier units. Combinations of gama attenuators betveen fluors and optical attenuators between different detector unite on the same fluor enabled the attainment of complete coverage from the 3th generation level to well above the peak expected farma signal, The detector outputs vere trangitted by cable to recording oscillographs located in the blockhouse where cameras provided a permanent fils record of the signals. In adtition to the “oghouse® detectors «a fluor-photomultiplier unit logated two feet ‘rom the Jevice in the cab enabled individual neutrons to be detecte? po that the initiation time might be determined. BESULIS The reaction history experiment wes successful in poamunipe the high explosive transit time and the reaction rate of cee device. yrapeit Tipe: The high explosive transit time was measured to to MIN«con tne raunit pulee to the tine of rise Me of the ENS neutron pulse. Alpbe: Preliminary reaction history results are indicated in Pig. 22.l-]1 an? 22,1-2. Pig, 22.1-1 is a plot of the equivalent gama Mev BEST AVAILABLE COPY -ihe quam co)