3Operation
The guidelines in this chapter describe how to use the Digilert 100.
Units of Measurement
The Digilert 100 is designed both for users of conventional units (milliroentgens per hour and counts per minute) and for users of SI units (microsieverts per
hour and counts per second).To switch between conventional and SI units, use the Utility Menu.See "The Utility Menu" in this chapter.
Starting the Digilert 100
Be sure that a standard 9-volt alkaline battery is installed in the battery compartment in the lower rear of the Digilert 100.Note:When installing the battery, place the battery wires along the side of the battery and not under it.
To start the Digilert 100, set the top switch to the mode you want, and set the bottom switch to On or Audio.The Digilert 100 then does a four-second system check, displaying all the indicators and numbers.
After the system check, the radiation level is displayed in the selected mode. One minute after you start the Digilert 100, a short beep indicates that enough information has been collected to ensure statistical validity.
Operating Modes
When the mode switch is set to mR/hr or CPM, the numeric display is updated every three seconds.At low count rates, significant changes in the radiation
level displayed can take up to one minute to stabilize.See "Operating Ranges and Response Times" in this chapter for more information.
CPM (or CPS) and timed total counts are the most direct methods of measurement; mR/hr (or μSv/hr) is calculated using a conversion factor
optimized for Cesium-137, so this mode is less accurate for other radionuclides, unless you have calibrated the Digilert 100 for a specific radionuclide using an appropriate source. It is more appropriate to measure alpha and beta activity
using CPM than using mR/hr.Conversion for alpha and beta emitters is calculated differently, and the Digilert 100's reading in mR/hr may not be accurate.
The most immediate indicators of the radiation level are the count light, the audio beep, and the alert.It takes three seconds before an increase is shown on the numeric display in the dose rate modes.
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