DUAL ALPHA SPECTROMETER. A SELF-CONTAINED, DOUBLE-WIDE NIM MODULE THAT CONTAINS TWO INDEPENDENT ALPHA-SPECTROSCOPY CHANNELS. EACH CHANNEL INCLUDES VACUUM CHAMBER, SAMPLE HOLDER, DETECTOR, BIAS SUPPLY, PREAMPLIFIER, AMPLIFIER, BIASED AMPLIFIER, TEST PULSER AND DISCRIMINAT. SEPARATE ENERGY RANGE SELECTIONS FOR EACH CHANNEL : 3-5, 4-6, OR 5-7 MeV AND 3-7, 4-8, OR 5-9 MeV. AVAILABLE WITH DETECTOR AREAS OF 200mm SQ, 400 mm SQ AND 600mm SQ.- FOR DETECTION OF POWER OF ALPHA IONS.

GIR1. HEADING 90.30 COVERS INSTRUMENTS AND APPARATUS FOR MEASURING OR DETECTING ALPHA, BETA, GAMMA, X-RAY, COSMIC OR OTHER IONISING RADIATIONS: GIR6. TERMS OF ONE-DASH SUBHEADING 9030.10, COVERS INSTRUMENTS AND APPARATUS FOR MEASURING OR DETECTING IONISING RADIATIONS: TERMS OF TWO-DASH SUBHEADING 903010.90, OTHER THAN FOR USE IN CIVIL AIRCRAFT.