1. INTRODUCTION page 2
Model PRM-470B
The instruments covered by this manual have been modified to operate on a set of four AA size,
alkaline batteries. The instrument will operate for approximately 24 hours on a fresh set of
batteries.
The PRM-470B operates in two modes:
• Search mode - to locate radioactive material
• Background mode – to measure radiation intensity
Two rotary switches control sensitivity while in the search mode. The switches are located on
the PRCB-474 PC board inside the instrument. The range of the sensitivity adjustment is 0.1 to
10.0 sigma.
There are two options for displaying the data:
• cps
• µsieverts
There are two rotary dip-switches located on the PRCB-001 board that control the display mode.
If both switches are set to "0", the display is in cps.
NOTE:
The µsievert conversion is not compensated for energy. It is strictly a linear conversion of
counts per µsievert.
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