HIGH RESOLUTION FAST CHOPPER DETECTOR USING BF$sub 3$ COUNTERS
Technical Report
·
OSTI ID:4326097
Time delays between signals from banks of BF/sub 3/ counters are used in the Materials Testing Reactor fast chopper to effectively reduce the counter length from 10 in. to 2 in. For the 45 meter flight path, this improves the instrument resolution from 0.13 to 0.05 mu sec/meter for neutron energies greater than 10 ev without reducing the counter efficiency. An effective counter length of 2 in. in the neutron beam is normally used, and 1 in. (the counter diameter) can be used when needed. When the 1 in. effective length is used, the detector does not affect the instrument resolution at energies normally studied with the chopper Five counter banks of 16 counters each are connected in parallel with separate delays for four banks. The signals from the five banks are mixed and fed through a common amplifier after being delayed and amplified in separate preamplifiers. Pulse height distributions, gamma discrimination techniques, and other features are discussed. (auth)
- Research Organization:
- Phillips Petroleum Co. Atomic Energy Div., Idaho Falls, Idaho
- DOE Contract Number:
- AT(10-1)-205
- NSA Number:
- NSA-12-002039
- OSTI ID:
- 4326097
- Report Number(s):
- IDO-16355; PTR-89
- Country of Publication:
- United States
- Language:
- English
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