17
OBTAINING AN AVERAGED COUNT RATE
The user can initiate the acquisition of an averaged,
statistically- significant count-rate to improve the accuracy of
the count rate reading for an exact target region. The user
must hold the probe perfectly steady during this acquisition.
When this feature is initiated, the
TruNode®
System will:
For count rates greater than or equal to 40 counts per
second.
The system will count for 2-10 seconds and return a
count rate measurement with better than or equal to
±
10%
accuracy with 95% confidence. Very high count rates will be
measured very quickly to very high accuracy (e.g.
1,000CPS target: 2 seconds counting time,
±
10%
accuracy with 99% confidence).
Or
For count rates below 40 counts per second.
The system
will count for 10 seconds and return a count rate
measurement that is more accurate than the instantaneous
reading but to less than +/-10% accuracy with 95%
confidence. Very low count rates will have much lower
accuracy (e.g. 5CPS target: 25% accuracy with 95%
confidence).
7.
AFTER SURGERY
Dispose of the Probe in an appropriate bio-hazardous waste
container.
Turn off the UFU:
•
Press the ON-OFF control switch located on its top-left
edge for approximately 2 seconds, until the power off
options appear.
•
Follow the instructions that appear for powering off the
UFU.
NOTE: The UFU must be turned off before the next procedure or it
will not connect with another Probe.
