Features

• In order to ensure that the dosimeter (DOSICARD™) is operating correctly, a radiological calibration procedure must be carried out periodically (once a year)
• The calibration standard is the individual dose equivalent H_p(10) whose unit of measurement is the Sievert (Sv)
• The dosimeter is exposed to a beam of radiation for a few minutes with photons having a radiant energy of 662 keV (¹³⁷Cs)

Description

The Calibrator/M consists of:

• A dosimeter handling and positioning conveyor drawer:
  • A test slot allows positioning the dosimeter for exposure to the ¹³⁷Cs control source.
• A ¹³⁷Cs source and its lead shield, designed as a collimator:
  • Activity of the source of 137Cs - 1.11 MBq (30 ìCi).
  • The source is placed 3.5 cm (1.4 in.) from the DOSICARD's detector.
  • Dose rate - 88 ìSv/h (8.8 mrem/hr).
  • Precision of the measurement - ±6%.
  • Irradiation time of the dosimeter - from four to 15 minutes (specified by the operator).
  Note: The dose rate at the lead shield is <0.1 Gy/h (10 rad/h).
• An electronic control device allowing:
  • An input/output board ensures the control of the drawer as well as the position of the dosimeter test slot. The drawer has three pre-defined positions:
    • Loading/Unloading of the DOSICARD (enables the operator to load or unload DOSICARDs into the calibration bench).
    • Communication (sets the DOSICARD's parameters before irradiation and analyzes the measurement results).
    • Irradiation (the DOSICARD is positioned for exposure to the control source during a length of time defined by the operator).