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. 2012 Feb;70(2):388-91.
doi: 10.1016/j.apradiso.2011.10.008. Epub 2011 Oct 25.

Comparison of calibration results for an extrapolation chamber obtained with different 90Sr+90Y secondary standard sources

Patrícia L Antonio  1 , Valdir S Carvalho, Linda V E Caldas
Affiliations

Comparison of calibration results for an extrapolation chamber obtained with different 90Sr+90Y secondary standard sources

Patrícia L Antonio et al. Appl Radiat Isot. 2012 Feb.

Abstract

Two secondary standard systems of beta radiation were used to calibrate a PTW extrapolation chamber Model 23391. Three (90)Sr+(90)Y sources of different activities were used in this calibration procedure. Medium-term stability of the response of the chamber was also studied. The calibration was performed with and without field-flattening filters. The relative standard deviation of the obtained calibration factors was 8.3% for the aluminum collecting electrode and 4.1% for the graphite collecting electrode.

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