ay Project 22,1 - Reaction History - L. F. Wouters E. C. Woodward CESCRIPTION CF THE EXPERIMENT The gamma rays produced by the nuclear reactions were detected by flour photocell detectors located in a lead lined detector pit located near the recording station some 2750 feet from the device. Collimation was provided by a 10 foot high by 12 foot wide wall in the cab consisting of 6 inches of lead and 12 inckes,of peraffin with appropriately stared 1c: ieee . . ‘ two collimating disks on short towers between the device and the detector pit, and a 27 foot lead pipe attacked to the detector pit. The disks and pipe restricted the view of the detectors to the wall and the portions of tke device observable trrovugh the two holes in the wall. fluors were positioned in tandem along the collimated gamma path and were observed by a total of three protodiodes and four protomultiplier units. Appropriate combinations of gamma attenuators between fluors and ortical attenuators between cifferent detector units on the same fluor rade possible the complete coverage of a dynamic range of 10°, The detector outputs were transmitted by cable to some 35 oscillograrpks located in the recording station where cameras provided a permanent film record of the signals. EXPERIMENTAL RESULTS DELETED Ui © aEpIDot Ww .