Overview
The FNS-100 is a high efficiency, high resolution fast neutron spectrometer. The detector is a multi-wire 3He ion chamber with a dense quenching gas. The availability of both high efficiency and exceptional resolution in one instrument makes the FNS-100 useful for nuclear science and engineering, materials research and radiation protection.
The FNS-100 is supplied with an integral cadmium and boron shield to reduce its sensitivity to thermal neutrons. The residual thermal neutron peak is a convenient feature for energy calibration and stability monitoring. The FNS-100 spectrometer, as provided with custom preamplifier and notch filter, is fully compatible with standard spectroscopy electronics (not provided) like those used with Ge spectrometer systems.
- Unsurpassed resolution < 20 keV (thermal peak)
- Matched preamplifier
- Notch filter for reduction of microphonics
- Compact, lightweight
Technical Specifications
- Spectral Range 0.1 - 5.0 MeV
- Resolution - Thermal < 20 keV FWHM
- Resolution - 1 MeV < 30 keV FWHM
- Efficiency, Absolute at 1 MeV 3 x 10-4
- Detector Size 6.4 x 57.4 cm or 2.5 x 22.6 in (diameter x length)
- Effective Length 15 cm (9 in)
- Preamplifier Size 11.0 x 8.0 x 4.0 cm (4.3 x 3.1 x 1.6 in)
- Anode Bias +3000 V
- Grid Bias +850 V
- Preamplifier +/- 12 V (NIM std)
- Output Amplitude -50 mV/MeV
- Output Impedance 50 ohms
- Risetime 0.2 to 5 microseconds (10 to 90%)
- Falltime ~1 millisecond
- Shaping 4 microsecond Gaussian