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Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator

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Count rate limitations for pulse-counting instrumentation in pulsed accelerator fields.

Alan L Justus¹

¹Los Alamos National Laboratory, Los Alamos, NM 87545, USA. ajustus@lanl.gov

|December 3, 2011

Summary

This study examines counting losses in pulse-counting health physics instruments exposed to accelerator radiation. It details how pulse characteristics and neutron moderators affect instrument accuracy, crucial for setting usage limits.

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Area of Science:

Health Physics
Accelerator Physics
Instrumentation

Background:

Pulse-counting instruments are vital for radiation monitoring.
Accelerator environments present unique challenges due to pulsed radiation fields.
Understanding counting losses is critical for accurate radiation measurements.

Purpose of the Study:

To analyze counting losses in pulse-counting instrumentation within accelerator radiation fields.
To establish appropriate limitations for using such instruments in these environments.
To investigate the impact of pulse characteristics on measurement accuracy.

Main Methods:

Analysis of "narrow" and "wide" pulse cases relative to instrument dead time.
Evaluation of the influence of neutron moderating assemblies.
Examination of pulse fine microstructure effects on counting losses.

Main Results:

Counting losses are significantly influenced by the relationship between accelerator pulse width and instrument dead time.
Neutron moderators and pulse microstructure can exacerbate counting losses.
Specific examples illustrate the practical implications of these effects.

Conclusions:

Accurate radiation measurements in accelerator fields require careful consideration of pulse-counting instrumentation limitations.
Understanding pulse characteristics and environmental factors is key to mitigating counting losses.
The findings provide a basis for establishing operational limits for health physics instruments in pulsed radiation environments.