9 MN1007-C
Measurements may be taken in units of counts per second (cps) or - in the case where specific nuclides have been
selected - Becquerels per square cm (Bq/cm
2
).
The Bq/cm
2
measurement function is used to quantify the levels of surface activity of a particular nuclide. It is
important that the users have prior knowledge of the type of nuclides present in the deposition so that the
measurements can be set up and interpreted correctly.
Contact radiation.monitors@tracerco.com for further details regarding radionuclide spectrum analysis of
sample materials.
Figure 1 - Geiger Müller (Pancake) Probe
The detection sensitivity of the probe for alpha and beta emissions from scale materials may be significantly
reduced if the surface is wet or obscured by oily deposits.
Although in such circumstances the probe will continue to respond to any gamma ray emissions with only a limited
reduction in sensitivity, the reduced contribution from the alpha and beta particle detection will result in a significant
overall loss in sensitivity relative to a dry surface.
The Geiger probe has been calibrated with a number of response factors to allow measurement of Bq/cm
2
for
specific nuclides. The nuclide options which are provided includes Radium-226 in the form of wet or dry scales and
Lead-210, again in the form of wet or dry scales. The operator is able to select the required nuclide through the
instrument’s configuration menu [See section 0]
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General