A TOTAL ABSORPTION GAMMA RAY SPECTROMETER COMBINING SODIUM IODIDE AND PLASTIC SCINTILLATORS

Journal Article · Fri Apr 01 04:00:00 EST 1960 · Nuclear Instr. & Methods

DOI:https://doi.org/10.1016/0029-554X(60)90069-0· OSTI ID:4168707

Ellett, W H; Brownell, G L

An 18 in. x 18 in. plastic well scintillator is used to monitor the escape radiation from a Sin. D Nal well crystal. Coincident events in both scintillators are rejected by means of an anticoincidence circuit. The detectors are mounted in a 2 ton lead and mercury shield so they can be used for the radioassay of low activity samples. Design of electronic equipment used with the plastic scintillators is considered and data are presented on the effectiveness of the anticoincidence mantle in improving the performance of the Nal crystal by (a) reducing the Compton spectrum, (b) increasing its efficiency as a sum spectrometer. and (c) reducing its background spectra. Expressions are derived for the efficiency of the plastic mantle in detecting escape radiation from the Nal crystal and compared to experimental data. (auth)

• Research Organization: Massachusetts General Hospital, Boston
• NSA Number: NSA-14-014914
• OSTI ID: 4168707
• Journal Information: Nuclear Instr. & Methods, Journal Name: Nuclear Instr. & Methods Vol. Vol: 7
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
BACKGROUND
COINCIDENCE METHODS
COMPTON EFFECT
ELECTRONIC EQUIPMENT
ENGINEERING AND EQUIPMENT
GAMMA SPECTROMETERS
LEAD
LIQUID METALS
MEASURED VALUES
MERCURY
PERFORMANCE
PHOSPHORS
PLANNING
POLYMERS
RADIATION DETECTORS
SAMPLING
SHIELDING
SODIUM IODIDES
TESTING