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A simple test device for electrometers

B Blad1, P Wendel, P Nilsson

  • 1Department of Radiation Physics, Lund University Hospital, Sweden.

Physics in Medicine and Biology
|September 2, 1998
PubMed
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Regular calibration of electrometers ensures accurate patient dosimetry. A new, simple test device effectively verifies electrometer functions, showing results consistent with national standards.

Area of Science:

  • Medical Physics
  • Instrumentation Science

Background:

  • Electrometers are crucial components in dosimetric instruments for accurate patient dose measurement.
  • Regular verification of electrometer performance is essential for maintaining treatment accuracy and patient safety.

Purpose of the Study:

  • To introduce and evaluate a simple, accurate test device for routine electrometer calibration.
  • To assess the device's capability in verifying key electrometer measurements.

Main Methods:

  • Development of a straightforward test device for electrometers.
  • Testing of multiple electrometers using the developed device.
  • Comparison of calibration results with those from the Swedish Standard Dosimetry Laboratory (SSDL).

Main Results:

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  • The test device accurately measures current, resistance, voltage, and charge.
  • Input resistance of electrometers can be determined using the device.
  • Calibration factors derived from the test device show strong agreement with SSDL calibrations.

Conclusions:

  • The developed test device provides a reliable method for routine electrometer checks.
  • This tool aids in maintaining the accuracy of dosimetric instruments.
  • The device's performance is validated against national metrology laboratory standards.