3. OPERATING INSTRUCTIONS page 13
Model PRM-470B
3.7. RECOMMENDED SETTINGS
There are two user adjustable parameters.
• n*sigma
• counts/µsieverts.
Both of these parameters are set using rotary dip-switches mounted on the main circuit board.
When the instrument is shipped from the factory the switches are normally set for n*sigma = 3.0,
and counts/µsieverts = 00.
The switches are read on power-up, so changing the switches while the instrument is operating
will have no effect.
3.8. TYPICAL SEARCH PROCEDURES
The following search techniques are drawn from examples given in the Los Alamos National
Laboratories User’s Manual, "Hand-Held Search Monitor for Special Nuclear Materials", by
Paul E. Fehlau (1984).
These techniques may serve as a general guide for search procedures. It is recommended to refer
to your specific site regulations and Operating Procedures prior to search operation.
The efficiency of the search improves with close proximity to the article or person being
searched, a thorough scan of all surfaces, and adequate time to allow the instrument to respond.
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