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Calibrating and testing tissue equivalent proportional counters with 37Ar

E Anachkova¹, A M Kellerer, H Roos

¹Strahlenbiologisches Institut, Universität München, Germany.

Radiation and Environmental Biophysics

|January 1, 1994

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A novel method uses Argon-37 (37Ar) for calibrating tissue equivalent proportional counters. This technique offers whole-volume testing without detector modification, unlike traditional methods.

Area of Science:

Nuclear Instrumentation
Radiation Detection Physics

Background:

Tissue equivalent proportional counters (TEPCs) are crucial for radiation dosimetry.
Existing calibration methods using X-rays or alpha particles are limited, testing only small sub-volumes and requiring detector modifications.

Purpose of the Study:

To introduce and validate a new method for testing and calibrating TEPCs.
To demonstrate the efficacy of using Argon-37 (37Ar) as a calibration source.

Main Methods:

37Ar was produced by exposing natural argon to thermal neutrons.
The effect of 37Ar admixture on TEPC function was assessed up to a 0.01 volume ratio.
The method was applied to a long cylindrical counter within a multi-element configuration.

Main Results:

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Argon admixture up to a 0.01 volume ratio did not significantly affect TEPC performance.
The 37Ar method allows for calibration and resolution testing representative of the entire counter volume.
This technique eliminates the need for detector modifications required by conventional calibration sources.

Conclusions:

Argon-37 provides a non-invasive and comprehensive method for TEPC calibration and testing.
The described method is suitable for various TEPC designs, including multi-element counters.
This approach enhances the accuracy and practicality of radiation detector characterization.