• Medical Physicists,  Dosimetrists

Prerequisites:  Knowledge of dosimetry protocols (TRS398, TG51,…)  

Workshop Description:
A short explanation on the objectives of the workshop and on the benefits of calibrating ionization chambers in terms of absorbed dose to water will be given followed by hands-on practical session which will include the following procedures:

• Checking the alignment of the Central beam axis and the field size light cross hair
• Setting up the water phantom and the chamber at the reference conditions (SSD=100 cm SSD, Field size = 10 cm X 10 cm , depth in water = 5 cm)
• Setting up the electrometer (polarizing voltage, range and mode, zeroing, collecting time, ..)
• Verification of the leakage current,
• Determination of the reference dose rate using the Secondary standard Chamber and applying the TRS398 code of practice
• Calibration of user’s chamber using substitution method and establishment of a calibration certificate

Learning Objectives:

Upon completion of this workshop, attendees should be able to demonstrate their understanding:

1. Perform the tests before the calibration of ionization chambers
2. Setup the experimental devices for therapy level calibration
3. Experimentally determine the reference absorbed dose to water using a reference chamber
4. Calibrate any ionization chamber in terms of absorbed dose to water