1. The Principle of Operation of the LB 124 Scint LB 124 Scint
4
When you select the unit Bq/cm
2
and the respective nuclide, the
LB 124 Scint automatically converts the cps measured into
Bq/cm
2
. To measure the area activity, the software comprises
an (editable) nuclide library containing at present approx. 60 dif-
ferent nuclides and the respective calibration factors. Moreover,
two free entry positions are available, where you can enter e.g.
calibration factors for other nuclides.
What can you do if you don‘t
know the nuclide? As things are not always that clear in practical operation, but
you are often dealing with nuclide compounds, unknown or only
partly known nuclides, the following solutions are at your dis-
posal:
Determine an
unknown nuclide An unknown nuclide can be determined by means of a half-life
measurement. Proceed as follows: On the Measurement
menu, select the item Half-life Value (see chapter 6.4.5).
Nuclide compound of
unknown composition When you are dealing with unknown compositions, you can se-
lect a calibration factor representing an average value of the
most frequently occurring beta radiation sources after nuclear
power station accidents.
When the nuclides are not known, please select the option β-
Tot (Beta total).
Nuclide compound of
known composition If you wish to measure the activities of several nuclides that are
known to you at the same time, you can do the averaging your-
self (and also the weighting, if required), and then enter the ca-
libration factor. The free entry positions that are at your disposal
for this purpose are dealt with in chapter 6.6.
Another possibility is to preset a so-called radioactive tracer.
This means that you select one of the isotopes stored in the nu-
clide library of your device; this isotope should be one of aver-
age energy and should correspond with the nuclide compound
to be measured.
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