NEUTRON MONITOR, MODEL 5 (Engineering Materials)

Technical Report · Wed Oct 30 23:00:00 EST 1963

OSTI ID:4625486

The portable instrument is used to make quick, accurate, dose-rate measurements of neutrons with energies from thermal to 7.0 Mev. Dose rates are reported in terms of rems. The instrument responds to thermal neutron energies within plus or minus 4% and to fast neutron energies within plus or minus 15%. Information obtained with this instrument is ordinarily more accurate than that obtained with the thermal and fast neutron monitoring instruments usually used. Where the scattering of intermediate energy neutrons contributes significantly to the total dose, this instrument detects and evaluates the dose rate with reasonable accuracy and with no assumptions or calculations required. The detector is a lithium iodide crystal 4 mm in dia. and 4 mm thick. The crystal is more than 80% black'' for thermal neutrons. The crystal is coupled to a photomultiplier tube by a light pipe wrapped in aluminum foil to limit light loss. The light pipe containing the lithium iodide crystal is inserted into a 10 in. polyethylene sphere which is calibrated with either thermal or fast neutron fluxes. The output of the photomultiplier tube is fed through a standard preamplifier and amplifier. (F.L.S.)

• Research Organization: Los Alamos Scientific Lab., N. Mex. Page(s): v
• NSA Number: NSA-17-039445
• OSTI ID: 4625486
• Report Number(s): CAPE-984
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
ALUMINUM
AMPLIFIERS
CRYSTALS
DOSEMETERS
ENERGY
FAST NEUTRONS
FOILS
INSTRUMENTS AND INSTRUMENTATION
LITHIUM IODIDES
LOSSES
MEASURED VALUES
MONITORING
NEUTRON DETECTION
NEUTRON FLUX
NEUTRONS
PERFORMANCE
PHOTOMULTIPLIERS
POLYETHYLENES
RADIATION DOSES
SCATTERING
SPHERES
THERMAL NEUTRONS
TUBES