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MN1008-C
2.6 Measuring Radiation
Switching on the monitor will display all available segments for 2 seconds.
The monitor then enters normal operation. All previous information on peak radiation dose
rate and accumulated radiation dose will have been re-set to zero following the power
down.
2.6.1 Bar Chart Display
The monitor provides a bar chart display which you may prefer to the digital numeric
display for providing an improved visual indication of dose equivalent rate trends in the
region of 0 to 1000μSv/h.
If the monitor is exposed to radiation higher than 1000μSv/h, the barchart display will
stay at full-scale until the radiation detected drops to below 1000μSv/h.
2.6.2 Numeric Display
The display provides a continuous numeric display of dose equivalent rates from 0 to 1000
μSv/h.
If radiation readings go above 1000μSv/h on the digital numeric scale, the display will
show an OVER warning. In this situation, the monitor cannot provide a measurement of
radiation dose exposure. If the level of radiation drops below 1000μSv/h, the monitor will
return to normal operation.
2.6.3 Accumulated Radiation Dose
An important feature of the monitor is its ability to record an accumulated dose. Once the
monitor has been switched on, the accumulated dose will be continuously updated in the
monitors memory. The yellow mode (–) button allows you to view the accumulated dose
in μSv on the digital display. Pressing the button allows you to switch between the digital
read-out of dose rate (in μSv/h) and the accumulated dose (in μSv).
To end the accumulation, simply press the green SELECT/RESET button when in the
accumulated (μSv) mode. This will reset the dose to zero and a new accumulation will
start. The accumulated dose function allows you to use the monitor as an integrated
dosimeter and is useful in carrying out assessments of potential dose uptake by individuals
during the performance of certain operations or establishing a time integrated dose from
which average dose rate values can be calculated. This is particularly useful where dose
rates are extremely low and variable with time.
