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Technology Factsheet

In-Situ Underwater Gamma Spectroscopy

Category: Characterization > Monitors > Radiation Monitors
Reference # : OST/TMS No 2990, DOE/EM-0588 Model No :

The In-Situ Underwater Gamma Spectroscopy system (ISUGS) uses existing instrumentation and computer software developed by Canberraadapts it for use as a submersible unit, and modifies the efficiency calculations. Canberra developed the technology for Framatome Technologies, who provide the service. ISUGS components include the In-Situ Objecting Counting System (a 3 keV – 2 MeV germanium detector), high-voltage power supply, single-port multi-attitude liquid nitrogen cryostat and remote detector chamber, submersible housing with electronics and vent umbilical, 10 externally mounted interchangeable shielded collimators, multi-channel analyzer, notebook and desktop computers, and associated software. A wall-mounted detector support bracket with adjustable X-Y slides, dual elevation wire rope rigging attachments, and detector housing strongback with distance measurement device were developed for this demonstration. The submersible unit with detector and the collimators weighs approximately 500 pounds. This technology can operate in relatively high radiation fields with dose rates from 0.050 to >1,000 R/hour.


- Reduces worker exposure - Accelerates schedule - Less than 5 minutes compared to 65 days to get data. - 1/2 to 1/5 the cost of the Baseline - Reduces spread of contamination - Minimizes secondary waste


The ISUGS technology is limited to underwater applications and should not be deployed directly over fuel rods due to concerns over accidental breakage. Another limitation is objects which cannot be moved to the ISUGS unit for scanning due to weight, size, radiation and safety concerns, or deteriorating condition. Some objects could break when moved within the pool water.




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