Johnson Matthey TRACERCO T401, User Manual, Page: 10 / 26

5 Measurement of Radiation Contamination
5.1 Procedure
Switching on the monitor will display all available segments for approximately 2 seconds (as shown below).
A check should be performed for any missing segments .
For the following 2 seconds, the next ‘Cal Due’ date will show using a MM-YY format. The monitor then
enters normal operation (cps mode).
5.2 Bargraph Display
This display provides a reading in the range 0cps
– 1000 cps. Maximum resolution is provided in the
range 0
– 10cps, which is considered to be the most critical range for routine waste characterisation
purposes.
If the probe is exposed to activity levels which exceed the maximum count rate of 1000 cps, the
bargraph will remain at full scale deflection un til the source of radiation is removed.
5.3 Digital Numeric Display
There is a 5 digit digital display. For radiation levels below 100cps or 100 Bq/cm 2 the monitor will
give a reading to 2 decimal places. The maximum indication is 4000 cps or its equivalent in Bq/cm
2
5.4 Peak Display
The meter is capable of numerically indicating the highest radiation level to which the probe has been exposed
since the instrument was switched on. Switching off will clear this reading.
Pressing the green
“
PEAK
”
button will show this reading. (During this period peak value continues to
be updated). A second press of the
“PEAK”
button during this period will return monitor to norm al
function.
Pressing
“
SELECT / RESET
”
button whilst displaying the peak reading will reset the peak reading to
zero.
5.5 Mode / Select
The yellow
“
MODE
”
and green
“
SELECT / RESET
”
buttons are required when accessing various functions
associated with the monitor.