Keison Digilert 100 Operation Manuals - page 7
Off.
The Digilert 100 is not operating.
Mode Switch (2)
mR/hr
. The numeric display shows the current radiation level in milliroentgens
per hour from .001 to 110. When SI units are used, it shows the current
radiation level in microsieverts per hour, from .01 to 1100.
CPM.
The display shows the current radiation level in counts per minute from 0
to 350,000. When X1000 is shown, multiply the numeric reading by 1000 to get
the complete reading. When SI units are used, the display shows the current
radiation level in counts per second from 0 to 3,500.
Total.
The display shows the accumulated total of counts starting when the
switch is turned to this position, from 0 to 9,999,000. When X1000 is shown,
multiply the numeric reading by 1000 to get the complete reading.
Set Button (Figure 2 (4))
The Set button is used to set the alert, select items in the Utility Menu, and
set the Calibration settings. See “Using the Alert” and “Utility Menu” in
Chapter 3 and “Calibration” in Chapter 5.
+ and - Buttons (Figure 2 (5))
The “+” and “-” buttons are used to adjust the numeric display for timed
counts, alert settings, and calibration settings. See “Taking a Timed Count”
and “Setting the Alert” in Chapter 3 and “Calibration” in Chapter 5.
The “+” and “-” buttons can also be used to make selections in the “Utility
Menu”. For details, see “Utility Menu” in Chapter 3.
The Detector
The Digilert 100 uses a Geiger tube to detect radiation. Alpha radiation does
not penetrate most solid materials, so this Geiger tube has a thin disk of mica,
which alpha radiation can penetrate, on its end. The screened opening at the
top of the Digilert 100 is called the window. It allows alpha and low-energy beta
and gamma radiation to penetrate the mica end of the tube.
CAUTION: The mica end surface of the Geiger tube is fragile. Be careful not to
let anything penetrate the screen.
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