SAPHYMO MiniTRACE CSDF - Page 14

Instruction Manual for MiniTRACE CSDF
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Page 14 08/2012
You can select the following radionuclides. Associated built-in calibration factors are based
on ISO 7503-1:
• Am-241
• C-14
• Cl-36
• Co-60
• Cs-137
• I131
• Sr-90
• U-238
• User (see below)
If you would like to select another radionuclide, press the mode button once, wait three
seconds, and then select the radionuclide. The display will indicate whether an alarm
threshold has been activated for the activity measurement. The measurement will then start
automatically.
You can assign your own calibration factor for the radionuclide “User” using the software. For
further information see the software manual.
Note
: MiniTRACE CSDF cannot determine the radionuclide. Selection of the
radionuclide must be carried out by the user.
2.4.3.5.3 Surface contamination with a direct measurement
Select the “BQCM2” menu or “Bq” mode. For further details see Figure 3. To measure the
surface contamination with a direct measurement you will need to open the lid. With this
method you measure the nonadherent and adherent surface contamination.
With the lid open, move the detector slowly over the surface, without allowing the
MiniTRACE to touch the surface. We recommend activating the acoustic registration of
impulses (“SP oN” menu). If you find a contaminated area, position the MiniTRACE at this
point. The distance between the surface and the MiniTRACE grid should be as little as
possible; we recommend approx. 3 mm.
Before you start with this measurement you need to determine the background radiation and
subtract it from the later result. For further information see ISO 7503-1 or your national
guidelines.
Note: The closer you are to the surface, the better the results will be. Be sure not to
touch the surface with the MiniTRACE CSDF. In the event of contact, the
MiniTRACE CSDF could be contaminated and the contamination could be
spread.
2.4.3.5.4 Surface contamination with a wipe test
To work with this menu select “BQCM2” mode. For further details see Figure 3. The wipe test
is a common method for measuring surface contamination. It is an indirect measurement
technique; only nonadherent surface contamination can be determined. This test is useful if
external radiation levels are too high, if surfaces are inaccessible or if the radiation would not
be detectable. In these cases activity on the surface is sampled on wipe test smears. They
provide an efficient, convenient means of sampling contaminated areas with radioactivity on