Radiological Engineering and Health Physics Services
Model 102F Floor Scanner
Alpha/beta scanning with high-accuracy indoor positioning system
Our alpha/beta surface scanner offers significant time savings while essentially eliminating transcription errors and improving the quality of data. The system combines high accuracy indoor positioning (sub inch) and high-efficiency zinc sulfide plastic scintillator detectors to obtain data conformed to MARSSIM requirements.

Our floor scanner has been utilized in dozens of facilities and has continually been successful at locating contamination in areas otherwise labeled as clean. The effectiveness of the 102F is due to its ability to precisely control the scanning speed of the detector and the surface to detector height. In addition, the real-time mapping ensures that total scanning coverage is obtained and provides validation of the work to regulators.

The 102F not only eliminates the error associated with traditional hand scanning, it also incorporates a six zone high-efficiency zinc sulfide detector that allows the same work to be performed six times faster. When also accounting for the automated data collection and minimal post-processing, the system results in enormous cost savings and superior data quality.
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The 102F contains only a single sensor capable of determining the position within a room at < 2 inch accuracy. The sensor performs a sweep of the environment using infrared sensors every 25 ms to constantly maintain a fixed position while surveying.
The 102F uses a 6 zone ZnS plastic scintillator detector, each zone having an area of 100 square centimeters, to optimize scanning area for faster results. Four adjustable wheels maintain the detector spacing from the surface.
The system utilizes a Ludlum counter capable of handling 6 zones (alpha/beta) simultaneously, all controlled by the on-board laptop greatly simplifying the quality check procedures and ensuring matched data.
A laptop computer running the ERG software provides controls to the motor, Ludlum counter, and data logging. The software is completely graphical and can be operated with little or no training
A computer controlled stepper motor ensures that the velocity of the cart is precisely maintained ensuring that the MDA is consistent and data are spatially distributed for processing. A lever on the handle bar engages and disengages the motor allowing the cart to be pushed freely.
The real-time display provides both the position and heading of the cart, as well as the spatial location of the collected data.
The software continuously analysis thousands of sensor measurements every 25 miliseconds to determine the location of walls and other planar surfaces within the room. Once detected, the surface is automatically used to maintain a precise position of the cart.
At any time during the survey, a different part of the room or building may be added to the perimeter map allowing for entire buildings to be surveyed with ease.
See how the 102F saves significant time and money when compared to traditional hand scanning methods of a 12 meter × 12 meter room. Times are reflective of actual field work where both methods are consistent with a final status MARSSIM based survey.
Traditional Hand Scanning Survey Survey using ERG Model 102F
 ProcessTimeProcessTime
SetupThe room is sub-divided into 144 one-meter grids using a tape measure and chalk line or spray paint.20 minA scan of the room perimeter is obtained in seconds. The positioning system is capable of sweeping 240 degrees per scan, therefore most room perimeters are obtained in two scans.< 5 seconds
SurveyingEach square meter is surveyed by making both a 1-minute scan measurement and a 1-minute fixed-point measurement. Approximately 2.5 minutes per grid block and assumes no breaks/interuptions/rescans. Typical survey scan speed 2 inches/second.6 hoursThe Model 102F survey cart velocity is precisely controlled using a stepper motor. Both the velocity and counting interval are variable to achieve a desired MDA. Typical survey speed approximately 2 inches/sec.1.5 hours
DocumentationAlpha and beta values for both the scan and fixed-point measurements are recorded by hand for each grid. Assume 15 seconds per grid block and no review or QA/QC of data.0.6 hoursAll data (survey count data and associated positions) is automatically logged to electronic data file.0
Data AnalaysisSurvey data and daily instrument efficiencies are entered into spreadsheet to convert counts (cpm) to activity (dpm/100-cm²).1 hourFunction check data for each zone are queried from a SQL database and survey counts (cpm) are automatically calculated to activity (dpm/100-cm²).< 10 seconds
PresentationCommonly, a room is hand-drawn with individual grids containing the final calculated activity measurement.1 hourData are output to GIS shapefile format (.shp) or Excel file format. Because data are spatially correlated the room's survey measurements are plotted with no additional analysis.< 5 min
Total Effort Approximately 9+ hours  Approximately 1.5 hours