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The NAID unit is a NaI detector specially designed for use in the measurement of uranium enrichment, and is used by the International Atomic Energy Agency in Vienna, Austria, and other safeguards related organizations.
The NAID unit is a NaI detector specially designed for use in the measurement of uranium enrichment, and is used by the International Atomic Energy Agency in Vienna, Austria, and other safeguards related organizations. This detector is designed to be used in a variety of environments and, when combined with the Mirion IMCA uranium enrichment analyzer, permits automation of the energy calibration and temperature compensation. This detector employs a 241Am seed and thermistor mounted together with the 5.1 cm diameter by 1.3 cm thick NaI crystal. The americium acts as a pulser that produces a photopeak at the gamma-equivalent-energy (GEE) of approximately 3.0 MeV which is high enough to prevent interference with the 185.7 keV gamma peak produced from the decay of 235U. The seed and thermistor combination allows for automation of the energy calibration and compensation for differences in temperature drifts between the 185.7 keV peak and the 3.0 MeV GEE peak. The entire detector assembly is located within an integral, sealed housing.
The NAID unit is the detector of choice for situations demanding robust performance. The rugged housing of the NAID unit protects and secures the fragile internal components against minor impacts, and is splash resistant. The heavy duty LEMO single piece connector greatly simplifies setup with no individual BNC connectors to contend with and is extremely strong. It snaps securely into the detector and is easily disconnected with gloved hands.
Every NaI detector has a unique gain drift as a function of temperature. Each NAID unit may be optionally characterized by placing the detector in a temperature chamber and plotting the drift in the 185.7 keV and 3.0 MeV GEE peaks and thermistor value over a temperature ranges of –10 to +50 °C. This data is provided to the IMCA software in the form of a table. Stability of the system is 0.5% from –10 to +50 °C. This technique eliminates the individual temperature matching of the NAID unit to analyzers, and allows any detector to be used with any IMCA.
Mirion offers the NAID detector with LEMO connector, cable, and temperature characterization service that enables operation with full automatic stabilization and energy calibration of the IMCA in PMCN mode. See IMCA literature for details.