a) to check whether the limit values stipulated in regulations or
provisions have been exceeded, and
b) the contamination has been caused by a well-known radio-
nuclide.
If you are dealing with a mixture of radionuclides and you know
the individual nuclides, you can use a so-called reference nu-
clide which accounts for either the main portion of the mixture
or is particularly dangerous (with fresh fission products, this will
almost always be I-131).
Caution!
This measurement mode does not mean, however, that the
monitor is able to measure the contamination of a radionu-
clide in a mixture deliberately and selectively. It only evalu-
ates the contamination as if it were caused by the respec-
tive radionuclide.
New nuclide It is possible to add new nuclides or nuclides that were not yet
entered to the nuclide list. Go to the Nuclides menu and select
Add. Then enter all parameters mentioned above, such as
name, calibration factors, thresholds, etc. The new nuclide must
be activated to view it in the small nuclide list.
This measurement mode is used
a) to measure a nuclide that is not included in the nuclide li-
brary. Prerequisite is the calibration of the device with an
appropriate calibration source, or
b) to measure a particular nuclide mix containing nuclides from
the nuclide library.
5.3 Measured Result as a Function of the Contaminated Surface
The calibration factors for the Bq/cm² display determined at the
factory and stored in the LB 134 in the setting A-100 (according
to DIN 25415) refer to calibration sources having the dimen-
sions 10 cm x 10 cm and an activity certified by the German
Calibration Service respectively in the setting ISO 7503 (ac-
cording to DIN ISO 7503-1) refer to the active detector area and
an surface emission rate certified by the German Calibration
Service.
Comparative measurements with other devices which also dis-
play in Bq/cm², therefore, will only lead to consistent results
when these devices were also calibrated with such sources. So
if you get other values from comparative measurements than
those displayed by LB 134, please check
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