SIX-METER RADIUS BENT-CRYSTAL SPECTROGRAPH FOR NUCLEAR GAMMA RAYS
A 6-meter radius bent-crystal spectrograph for the precision measurement of nuclear gamma-ray wavelengths was designed, constructed, and placed into operation. This instrument is particularly well suited for directly measuring neutron-capture gamma rays produced by samples placed in the through port of the MIT research reactor. The spectrograph is designed to measure wavelengths of gamma rays in the energy region from 0.1 to 4.0 Mev with an estimated precision that varies from about 0.01% at 0.1 Mev to 0.3% at 4 Mev. Photographic methods are used to record the gamma-ray lines on the focal circle. A bent crystal is used to diffract and focus the gamma rays. Line-width and efficiency data were obtained for the (310), (003), and (006) planes of quartz. The efficiency of the instrument is quite low. In order to record a line at 2.0 Mev, and exposure time of about 6000 curie hr is required. (auth)
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-004134
- OSTI ID:
- 4137666
- Journal Information:
- Rev. Sci. Instr., Journal Name: Rev. Sci. Instr. Vol. Vol: 31
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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