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Updated: Jun 17, 2026
07:31
Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
Published on: May 9, 2014
IFIN-HH ionization chamber calibration and its validation; electrometric system improvement
M Sahagia1, A C Wätjen, A Luca
1Horia Hulubei National Institute of R&D for Physics and Nuclear Engineering, IFIN-HH, Bucharest, Romania. msahagia@nipne.ro
Summary
This study calibrated the CENTRONIC IG12/20A ionization chamber using 18 gamma emitters and a Keithley electrometer. Results were compared with international standards, showing good agreement for accurate radioactivity measurements.
Area of Science:
- Medical Physics
- Radiation Dosimetry
- Nuclear Instrumentation
Background:
- Accurate calibration of ionization chambers is crucial for reliable radioactivity measurements.
- The CENTRONIC IG12/20A is a standard instrument used in radiation metrology.
- Advancements in electrometers, such as the Keithley 6517A, can improve measurement precision.
Purpose of the Study:
- To calibrate the CENTRONIC IG12/20A ionization chamber for 18 gamma ray emitters.
- To evaluate the performance improvement offered by a Keithley 6517A electrometer.
- To compare calibration results with international standards and reference laboratories.
Main Methods:
- Calibration of the ionization chamber using 18 gamma ray sources.
- Utilizing a Keithley 6517A electrometer for improved current measurements.
- Determining calibration factors in picoampere per megabecquerel (pA MBq(-1)) units.
- Comparing results with the Key Comparison Reference Value (KCRV) and PTB-Germany data.
Main Results:
- The CENTRONIC IG12/20A ionization chamber was successfully calibrated for 18 gamma emitters.
- The use of the Keithley 6517A electrometer demonstrated potential for enhanced measurement accuracy.
- Calibration figures showed good agreement when compared with RML's standards, KCRV, and PTB-Germany values.
Conclusions:
- The calibration of the CENTRONIC IG12/20A ionization chamber was successfully performed.
- The Keithley 6517A electrometer contributed to improved calibration results.
- The obtained calibration factors are consistent with international metrology standards, ensuring reliable radioactivity measurements.
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