Sper Scientific 840024 Digital Radiation Meter - Manual (Page 14)

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CHECKING AN OBJECT
1. Establish background level (p.11)
2. Press the
button
3. Select measurement scale:
or
4. Hold the meter with the GM tube
side positioned as close as possible
to the object without allowing
contact. If the object is radioactive,
the radiation level will be highest at
a close distance and will decrease
proportionately as the distance from
the source increases. (For example,
a reading taken at a distance of six
inches (152mm) from the object will
be approximately one-fourth of the
reading taken at a distance of three
inches (76mm) following the inverse
square law.)