Final Survey Monitors

 
 

 

Final Survey Monitor

 

Technology

 

Features


Bartlett has designed the Final Survey Floor, Low Wall, and High Wall/Ceiling Monitors to reduce costs and uncertainties associated with the final surveys of decommissioned facilities.

The Bartlett Final Survey Monitor is a computer-controlled system that uses off-the-shelf components to reduce capital costs and simplify procurement of spare parts. The detectors are Ludlum Model 43-68 gas flow proportional counters that operate in a gas flow mode. This rugged, dependable, 100 cm² design has been used and/or specified in many final surveys including BNFL at Oak Ridge, Fort St. Vrain, Rocky Flats and Maine Yankee. The Bartlett Final Survey Monitor uses a modified Ludlum Model 2360 counting card that is networked directly to a PC or laptop through a terminal server.

There are eight detectors: two are used for background monitoring and as installed spares; six detectors are used to sweep a one meter wide strop of floor or wall.


The computer monitors the background count rate and temperature, then adjusts the count time and high voltage setting of the detectors to achieve the MDA and initiate a measurement.. All measurements are performed in a static mode. The computer reviews the results and immediately recounts any spots that returned ambiguous count values. The user specifies the range of automatic verification feature. The computer then automatically moves the detector array to the next position for another measurement. There is at least 8% overlap between the measurements to ensure 100% coverage of the surface area. The computer scans a one meter by one meter area, prints a report and immediately begins sweeping the next square meter while the report is printing. Data is available on a pen drive, floppy disk and CDROM.


Reports are generated showing the activity of each 100 cm² spot, the average for the square meter and the highest activity spot. The computer shows the status of each measurement on a real-time display. The operator can page backward to review previous measurements on the screen.

There is a gas distribution manifold that monitors the return gas flow from each detector and provides an alarm signal to the computer if any detector has inadequate flow.

The Bartlett Final Survey Monitor reduces financial risk because NRC, DOE and EPA criteria are generally specified in units of activity per 100 cm² averaged over one square meter. This is exactly the quantity measured by the Bartlett Final Survey Monitor. There is no uncertainty in whether the results satisfy regulatory requirements.
 

 
Final Survey Monitor Features

Using the Bartlett Final Survey Monitor provides economical solutions to the challenge of completing timely final buildings surveys:

• Extensive computer controls ensure measurement quality, precision and accuracy.
• The monitor always uses the minimum count time required to achieve the MDA.
• Suspect measurements results are immediately verified, eliminating the need for verification surveys.
• Reports are available immediately for each square meter
• Surveys and decontamination can be completed in days rather than weeks.
• The monitor will maintain accurate MDAs in low or high (ambient) temperatures by automatically adjusting detector efficiency.
• The “gridding” can be reduced. One meter wide strips can be marked on floors and walls with tick marks for each meter.
• A Dosimetry Clerk or Junior HP Technician can be taks-qualified.
 

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