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Radiation Protection Dosimetry 91:139-142 (2000)
© 2000 Oxford University Press

Measurement of Ultraviolet Radiation with Biological Dosimeters

A. Cabaj and R. Sommer

The measurement of UV radiation with biological dosemeters is in most cases performed using micro-organisms. The biological effect which may be used in this context is the inactivation of the micro-organisms exposed to UV radiation, the survival curve is measured and is used as the calibration curve for the measurement. As a biodosemeter, for instance, bacterial spores or viruses can be used. In one application biodosimetry is the only method which can be used: in measuring the dose in flow-through UV-disinfection plants for water. The biodosemeter is added to the water flowing into the disinfection plant and from the reduction of the micro-organisms the dose can be calculated as reduction equivalent dose (RED). Because of the inhomogeneous radiation field inside the plant every micro-organism receives a different fluence, this causes a distribution of fluences among the micro-organisms which have passed through the plant. In general the RED is lower than the arithmetic mean of the density function of the fluence distribution.


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