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The autoattenuation of photons was calculated analytically for a 192Ir metallic wire source and an aqueous standard source. The influence of the autoattenuation on the current of the calibrated ionisation chamber was also evaluated. The autoattenuation did affect considerably the ionisation current. It was concluded that the apparent radioactivity must be multiplied by a correction factor larger than unity (1.09 +/- 0.01 in the present case) to get the true radioactivity when the radioactivity of the 192Ir metallic wire source was measured with the ionisation chamber calibrated with the aqueous standard source of 192Ir.

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Authors: URITANI A, Nagoya University, Department of Nuclear Engineering (JP);MORI C, Nagoya University, Department of Nuclear Engineering (JP);GENKA T, Japan Atomic Energy Research Institute, Ibaraki (JP);REHER D F G, JRC Geel (BE)
Bibliographic Reference: Paper presented: ICRM '93, Teddington (GB), June 7-11, 1993
Availability: Available from (1) as Paper EN 37508 ORA
Record Number: 199310853 / Last updated on: 1994-11-29
Original language: en
Available languages: en