of , —_ @ Projeet 22,1 - Measurement of Alpha and Booet - L.F. Vouters BASPAIMENTAL The gemma rays produced by the sucleer reaction vere detected by flucr-photeeel] detectors loested in a lead lined “doghouse” 3,390 feet from the sero point. A 27 foot lead pipe served to ecllimate the game rays onto an array of four fluores. The four fluores vere positioned in tandem along the gamme path end vere observed by a total of three photo- diodes end four photomultiplier units. Costinations of game sttenustors: betveen flucrs and optiesl attenuators betveen different detector units on the seme fluor enabled the attainment of complete coverage from the Jéth ‘ generation level to well above the peak expected ,anme signs). The detector outputs were transmitted by ceble to recording ceciliogrephs located in the tlockhouse where caperas provided a permanent file record of the signals. BESULIS The reaction history experinent was successful in meqauring the high explosive transit time and the reaction rate of ae (i device. trenait The | » explosive transit time was measured to > oui the X-unit pulse to the time of 50th generation lev-) of the fission reaction. es oT en & YAILADLS SOpy Prelininary reaction history results are indicated in Fig. 22.1-1 and 22.1-2. Pig. 22.1-1 fe a plot of the gama flux (gems mev per on*. 00) incident at the detector station ve time as ottained from a slope - ® amplitude fit of the individual pleces of data. Pig. 22.1-2 is an elphe wa time curve derived from Pig, 22.1-1, Note that neither curve has . ee - 45 - 45 &