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Radiation Protection Dosimetry 106:273-276 (2003)
© 2003 Oxford University Press

Absorbed dose determination with plane-parallel chambers

C. Austerlitz

According to IAEA TRS 398 recommendations the determination of absorbed dose with plane-parallel ionisation chambers calibrated in terms of NK,Q0 can be done using ND,W,Q0 = (MQ0free air/MQ0surface) NK,Q0B[(µen/rho)w,air]Q0free airP. This equation takes into account only the scattering from the stem of the soft ionisation chamber, not the total scattering published in the scientific literature. That makes it difficult to perform dosimetry with field sizes different from those used in the standardisation laboratory to calibrate the chamber. This paper describes a method to calculate DW,Q0 by using either NK,Q0 or ND,W,Q0 for different radiation field sizes.


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