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Volume recombination parameter in ionization chambers

M Boutillon

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The parameter governing the volume recombination in ionization chambers has been measured under conditions which allow strict application of the basic theory. The method consists of measuring the ratio of ionization currents and obtained at two given voltages and as a function of . The value of is derived from a linear extrapolation to zero current. Several pairs of voltages (, ) were used. The value of obtained in this work is with a relative uncertainty of 1.7%. The dependence of on atmospheric conditions has also been investigated.


PACS

87.56.Da Ancillary equipment

87.53.Bn Dosimetry/exposure assessment

07.89.+b Environmental effects on instruments (e.g., radiation and pollution effects)

06.20.Dk Measurement and error theory

02.60.Ed Interpolation; curve fitting

Subjects

Computational physics

Instrumentation and measurement

Medical physics

Dates

Issue 8 (August 1998)

Received 7 November 1997, in final form 12 March 1998



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