Features
- The calibration certificates can include the following data:
- Factory calibration for detectors or complete dosimetry systems (SSDL calibrations upon request)
- Calibration factor and check reading of radioactive check devices for atmospheric standard conditions
- Correction factors for user-selected radiation qualities are available upon request
The calibration certificates from PTW-Freiburg document the traceability to primary standards, which provide the reference for the units of measurement according to the International System of Units (SI). Calibrations for the following measuring quantities are available:
- Absorbed energy to water Dw measured in Gray (Gy)
- Air Kerma Ka measured in Gray (Gy)
- Photon equivalent dose Hx and ambient equivalent dose H*(10) measured in Sievert (Sv)
- Exposure Js measured in Roentgen (R) – no SI unit
The standard procedure is factory calibration; formal DKD (SSDL) calibration can be performed upon request. The reference air pressure for calibration is 1013 hPa, and the reference ambient temperature can be 20 or 22 °C, which the user must specify. The uncertainties stated correspond to the double standard deviation (k = 2), calculated according to EAL-R21. If a radioactive check device is available, the check reading under standard conditions is stated on the calibration certificate.
- European Co-operation for Accreditation, Report No. 2, Edition 1, April 1997 “Expression of the Uncertainty of Measurement in Calibration”
Parts
Each chamber from new production comes with a calibration certificate including one factory calibration. Additional factory calibrations as well as SSDL (ADCL) calibrations are available at an extra charge. It is recommended to have the dosemeters recalibrated at appropriate intervals, usually every two years.
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