BNC SAM 935 Portable Gamma Spectroscopy System - Manual (Page 37)

SAM 935™ Instruction Manual 33
The Manual mode screen will appear:
2. Begin taking readings. When a spectrum is displayed, the message line will normally display the
cursor readout. Displayed are the cursor channel (CH), the energy (EN, if calibrated), and the
counts in the cursor channel (CNTS).
3. If everything is correct, press A CCEPT . The spectrum will be analyzed and the results displayed on
the screen. You can print either short or long versions of the analysis report by using the function
keys on the report screen. The long version includes: 1) system setup information, 2) a graphical
printout of the spectrum, 3) detailed peak analysis, and 4) the details of the isotope cross correla-
tion analysis. The short version of the report includes only items (1) and (3). An example of this
report can be found in Section 7.4.
4. When you exit the report screen you are back in the Manual mode screen. You can edit ROIs, take
data for longer, etc., and then press S
TART (F2) again to repeat the analysis.
5. To analyze another sample, simply E RASE (F3) the data and start again.
The cursor can be controlled with the arrow keys. The
←
and
→
keys move the cursor one channel at a
time along the spectrum, while the
↑
and
↓
keys move the cursor 1/16 of the spectrum at a time. The spec-
trum display is initially in its narrow mode, with the area at the right of the spectrum displaying a variety of
information. The initial set of information is called the “data” screen. Here the vertical scale, preset live
time, elapsed live time, and count rate in CPM is displayed. The information displayed in this area can be
changed by pressing F4. Just above the spectrum display is an area in which instructions, sub-mode titles,
or current spectrum data are displayed.
The initial set of function keys in the Manual mode have the following functions:
Exit (F1) The E XIT key causes you to exit from the mode. Data acquisition is
stopped and nothing is saved.
Start (F2) The S TART key begins data acquisition. Once it is pressed the label
changes to Stop. Data acquisition can be started and stopped as many
times as desired.
Erase (F3) The E RASE key erases the data and resets the elapsed real and live times
to zero. The key may be pressed at any time.
Pre Adj (F4) The P RE A DJ key changes what is displayed on the right side of the
screen to a display of the preset values of the system as shown below.
Note this message: Pressing the Util key in Manual
mode toggles a different set of function keys; see
Section 5.4.3.
WARNING: NO CAUTION IS GIVEN THAT DATA IS ABOUT TO BE ERASED