Dosimetry is the measurement of the absorbed dose calculated with the help of dosimeters. Correct understanding and utilisation of this technique are essential for validation, commissioning tests and control of this process.

The dosimetric system includes:

• "PVC" type dosimeters,
• a spectrophotometer to measure the optical density of the dosimeter being processed,
• a computer for automatic conversion of the optical density to the absorbed dose.

Calibration of each batch of routine dosimeters is done in accordance with international standards. The period of validity of the calibration is indicated, justified and complied with.