Digilert 100 as close as you can without touching
the object. The radiation level for gamma
radiation from a localized source decreases
according to the inverse square law. If you move
to twice the distance from the object, the radiation
drops by a factor of four.
CAUTION: Never touch the Digilert 100 to a
object that may be contaminated. You may
contaminate the instrument. A contaminated
instrument will not be accepted for repair or
servicing.
5 Maintenance
The Digilert 100 should be handled with care and
can be calibrated as necessary to comply with
regulations. Use the following guidelines to
maintain the Digilert 100 properly.
Calibration
The Digilert 100 should be calibrated as often as your regulations require. The
best way to calibrate is using a calibrated source. If no source is available, it is
possible to calibrate electronically using a pulse generator.
The standard radionuclide for calibration is Cesium-137. A certified calibration
source should be used. To calibrate the Digilert 100 for another radionuclide,
you must use a calibrated source for that radionuclide or the appropriate
conversion factor referenced to Cs-137.
CAUTION: In calibration mode, the smallest increment that can be adjusted is
.010, which prevents fine adjustment of the calibration factor. Thus, errors can
occur if you use a low-level source or background to set the calibration factor.
Calibrating Using a Source
Before you calibrate the Digilert 100, make sure the distance between the
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