Thermo Scientific SAM12, Manual

Page: 137 / 176

Issue: 1.0 Setting Up Procedure
Thermo Fisher Scientific SAM12 User Manual 9-3
Resetting the above Parameters will guarantee the integrity of
measurements. It is also important to reset the time and data
(see
CCM Setup (page 5-30) ) since these are used when check
the calibration due dates, and also by the Data option.
A listing of all the parameters is available by selecting
Instrument Configuration Report (page 5-38) . This report
should be either printed or saved to USB memory stick, when
the instrument is first set up, and when significant changes of
configuration are undertaken.
The SAM12 will be delivered optimised with a valid HV Scan
and optimum operating voltages stored. The exception being
the upgrade kit, where the SAM12 electronics needs to be
matched to the existing detectors. If the HV Scan needs to
undertaken for any reason, follow the procedure described in
HV Scan (page 5-25) .
The SAM12 will be delivered calibrated to both
137
Cs and
60
Co.
However if the user wishes to undertake a calibration check, or
to recalibrate, follow the procedure described in
Cal Check
(page 5-19) . Whenever the operating voltage on a detector is
changed, the instrument must be recalibrated.
The details of the current and previous calibrations are stored to
a backup compact flash. These backups take place
automatically after every calibration, and when requested by
the User. It is recommended that the backup is undertaken after
every voltage scan and calibration. This backup may be
retrieved if for any reason the hard drive on the instrument
needs replacement.
Selection of Detector Operating Parameters
The following sections assume that the instrument is set to the
factory defaults.
The Test and Performance Certificate supplied with each
instrument lists the recommended High Voltage settings for
each detector for the optimum detection.
HV Scan (page 5-25)
describes the setting of the detector HVs.
If, however, it is required to ascertain the optimum operating
voltages by measurement, e.g. due to new detectors, the
procedure described in
Derivation of the Optimum Operating
Voltage (page 9-4) should be followed. Calibration for other
nuclides and nuclide mixes is described in Calibration
Procedure (page 10-1) .
Detector HV Selection