SAIC Exploranium – GR-135 System Manual page: 53
TIME this shows the selected sample time, in this case 1 minute. Thus the progress bar
1 shows the progress of the 1-minute count time
MIN
the progress box shows the time progress to the end of the sample period (1 minute
in the example)
A.9 RESULTS
After the sample time is complete the system automatically
analyses
the data to determine the isotope of the material and displays the
results as shown.
TYPE – shows the category of the isotope identified.
Labels used are :
- IND – Industrial isotope
- MED – Medical isotope
- SNM – Special Nuclear Material
ISOTOPE – is the actual name of the isotope
SPECTRUM STORED AS #6 - every time an IDENTIFY analysis takes place the radiation data
(spectrum) from this analysis is stored in memory where it can be accessed with special
software for subsequent analysis by the users radiation experts as required. The display
advises the user what the data set is with the label SPECTRUM #6. This number can be
anywhere from 1 to 999 and serves to uniquely identify the data in system memory for use
during data retrieval and analysis.
An additional feature is that under special conditions the user may see various special nuclear
items that are NOT included in the system library. In this case the manufacturer can
analyses these data and if required the internal analysis library can be updated so in future
this type of material would be identified.
UP TO REPEAT SAMPLE – sometimes if the radiation levels of the material being analyzed are
very low, it is possible that, at the end of a 60 second sample period, the analysis of the
sample may show NO NUCLIDES FOUND. In some cases the user may wish to take a
longer sample to improve the analysis.
If the button is pressed UP (away from the user) then a second sample takes place. If the
system is set for a 1 minute sample time then pressing UP will take an additional 1 minute
sample, add it to the original sample to produce a 2 minute sample, store this in a second
spectrum in memory and carry out NUCLIDE IDENTIFICATION again. Perhaps this time the
improved data quality from a longer count will permit an identification to be performed.
This UP (to repeat the sample) can be performed as often as the user requires to build up a
larger and larger sample for analysis.
PRESS ENTER TO SEARCH – pressing ENTER moves the user to the SEARCH mode again
UNKNOWN ISOTOPE
The GR-135 has a wide selection of radioactive isotopes in its internal library. However it is possible
that a very rare isotope can be encountered. In this case the system cannot identify the isotope so
the message UNKNOWN ISOTOPE is displayed. If this message is seen we recommend that you
retrieve this stored spectrum and send it to hovgaardJ@SAIC.com
at Exploranium for further analysis.
TYPE ISOTOPE
I ND Cesium-137
PRESS ENTER TO SEARCH
NUCLIDE IDENT
SPECTRUM STORED AS #6
UP TO REPEAT SAMPLE
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