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Beta Source

Dust measurement with a radio-active source (beta source with non-damaging health risks from radio-active radiation) is made using an extractive dust meter in which a sub-flow is taken out from the process and irradiated with a beta source. In principle, a well-defined flue gas volume is taken out from the process to pass through a glass fibre tape. In this way, the dust particles from the process are deposited onto the glass fibre tape. This spot of dust particles are irradiated using the beta source. On the other side of the glass fibre tape a Geiger-Müller calculator is placed to calculate the irradiation that passes freely through the tape.

The amount of irradiation that the dust particles can absorb is an expression of the dust concentration in the process. The dust measurement is an absolute measurement, rendering a calibration by an accredited laboratory unnecessary.
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