Johnson Matthey TRACERCO T401, User Manual, Page: 12 / 26

5.8
Carry Out a “Nuclide Measurement”
Following selection of the background count the display moves to the Bq/cm
2
screen. Confirm this
choice by pressing the
“
SELECT / RESET
”
button, whereupon the message
‘
NUCL
’
will appear on
the screen. The previously selected radionuclide will also appear at the base of the screen. Scroll back and
forth through the various nuclide options using the
‘
MODE
’
and
“
PEAK
”
buttons to locate the one which
is required and confirm your choice by pressing the
“
SELECT / RESET
”
button. This operation will
also start the count integration.
(Note; there are 16 radionuclide options and one cps option, which, if chosen by pressing
“
SELECT /
RESET
”,
will revert the monitor to a cps display. Pressing the
‘
MODE
’
button will continue the scrolling
operation, pressing the
“
PEAK
”
button will scroll in opposite direction). The unit will display the value
of
“
Bq/cm
2
”
in real time.
Pressing the
“
MODE
”
button whilst in
“
Bq/cm
2
”
will return the digital display and associated
functions to cps mode. (NB: The analogue display will always display “live” cps, irrespective of which
functions are being selected in the digital display).
Each nuclide has a different response factor ie the number of counts detected by the monitor per becquerel of
activity and the correct value of activity will only be displayed if the operator has selected the actual nuclide
which is being measure. A mis-selection will result in either a higher or a lower value than the result,
depending on the exact circumstances.