Oa . 7. 8. 9. Power supplier for alpha barrier detectors, ND 254. Gated analog routers, combined 4 alpha signals into 2048 channels of memory, ND 568 with live time clock storage channel. Analog to digital converter, 8192 channel, 80 Mhz, ND 575, with 10 turn pots, for zero and threshold. Multiplexer unit, allowed mixing two signals alpha and gamma into one multichannel analyzer system. ND-DX-2, #88-0141 two input multiplex module. Pulse height analyzer (PHA), ND 600, with 4096 channel memory, table top CRT terminal, firmware option board ND 70-2434, ND 47-0055 intensified region peak extraction package, ND 47-0054 digital ratio option, ND 47-0056 intensified region LD. package. Alpha signals stored in first 2048 channels of PHA. Gamma Spectroscopy System 1. 2. 3. 4. 5. 6. Intrinsie germanium detector (IG-1), large area coaxial type, approximate 25% efficiency, vertical cryostat and 30 liter dewar, Princeton Gamma-Tech Model IGC 32 with Model RG-11C preamplifier, vertical cryostat and 30 liter dewar. Amplifiers-Princeton Gamma-Tech Model 340. Analog to digital convertors, 8192 channel, 80 Mhz, ND 575 with 10 turn pots for zero and threshold. Multiplexer unit, ND-DX-2 #88-0141 two input module. Pulse height analyzer (PHA) see alpha system above. Steel shields for gamma systems, 16-inch cube interiors, front opening door, 2-inch 1924 vintage steel walls with cutouts for down-looking or vertical detectors. * OIWMW A Pe we err wh! Gross Gamma System Detector, 2 x 2-inch Nal(T1) Eberline SPA-3. High voltage power supply - AEC 5000. Pre-amplifier, ND 404. Amplifier, ND 510. Single channel analyzer, ND 602. Scaler/timer, ND 719. Log/linear rate meter, ND 775. Shield, 4-inch lead brick 2 x 4 x 8-inch, hand stacked. Uninterruptible Power Supply l. Deltec Model DSU-1810 with rack mount external battery pack #RP-1810 and DS-2000 Mode! solid state transfer switch. Unit rated 1500 watts for 40 minutes. Supplied critical items in electronics rack. Gamma and Alpha PHA Readout 1. PHA serial interface digital equipment serial line Unit DL VIL Computer unit, Hewlett Packard Model 9831A with thermal printer Model 9866A, flexible dise drive Model 9885 M/s, tape memory interface units Model 98036A. 9877A, I/O expander Model 9878A, and serial Calculator 1. Hewlett Packard Model 97, programmable, printing. Nuclear Instrument Modules (NIM) 1. 2. NIM bin and power supply ND 88-0346 and ND 88-0297. Additional NIM modules were available and used as needed to keep the system operational. C-3-3