Quickscan; Natural Background Reduction (Nbr); Cobalt Coincidence Monitoring (Ccm); Residual Contamination Level - Thermo Scientific SAM12 Manual

Issue: 1.0

Quickscan

Natural Background
Reduction (NBR)
Cobalt Coincidence
Monitoring (CCM)
Residual Contamination
Level
Thermo Fisher Scientific
Quickscan is a method used to identify, within the monitoring
time T , whether the article is either "clearly" contaminated
mon
or clear, referred to as "real-dirty" or "real-clean". Quickscan
is enabled on the Options sub-menu (see
It is only activated when T
The Quickscan period T
of the monitoring cycle, at which the first time slice check is
undertaken. Subsequently further Quickscan checks will be
undertaken at periods that are integer multiples of T
3T , until the end of the monitoring period. The Quickscan
Q
period is set on the Params 2 sub-menu (see
10)).
If the Quickscan formula (refer to Thermo Fisher) is satisfied at
any of the Quickscan checks, then the monitoring cycle will
terminate, with the appropriate clean or contaminated
indication.
After a measurement resulting in an alarm, an NBR check may
be undertaken, if enabled on the Options sub-menu (see
Options (page 5-6)).
For details of the NBR assessment, please contact Thermo
Fisher Scientific.
A specific assessment of
undertaken, if enabled on the Options sub-menu (see
(page 5-6)). Further an alarm may be triggered specifically for
60
Co, although in most situations this alarm is unlikely to
trigger before the Normal alarm.
The method of assessment of background count rates and
contamination level, applies to the CCM channel in the same
way as for the sum of all detectors (gross sum channel)
described in this section. However both the background count
rate B and the efficiency E
CCMsum
than for the gross sum channel.
For details of the CCM assessment, please contact Thermo
Fisher Scientific.
After a measurement resulting in an Alarm condition, a
Residual Contamination Count (RCC) may be taken, if enabled
on the Options sub-menu (see
equal to the monitoring time (T
Technical Description - Physics
Options (page
>T
mon min
is the time period after the beginning
Q
Params 2 (page 5-
60
Co contamination may be
, are considerably lower
CCM
Options (page 5-6)). A count
) is enforced.
mon
5-6)).
e.g. 2T ,
Q Q
Options
SAM12 User Manual 6-9