Fluke Biomedical 10100AT - Manual (Page 64)

10100AT
Operators Manual
B-4
PTB Calibration Option
This calibration option replaces the standard calibration when PTB requirements must be met, or when
specifically requested by a customer. This option includes calibration at both of the beam qualities listed
below. Calibration factors are normalized to 20°C and 1013 hPa of atmospheric pressure.
Unattenuated beam: Calibration is performed at the Fluke Biomedical, Radiation Management Services
equivalent of DV70 (PTB defined as 70 kVp and first HVL of 2.45 mm Al).
Attenuated beam: Calibration is performed at the Fluke Biomedical, Radiation Management Services
equivalent of DH70 (PTB defined as 70 kVp and first HVL of 6.77 mm Al).
Other Calibration Options
Optional calibration points are the Fluke Biomedical, Radiation Management Services equivalent of L100,
M50, S75, DV30, DV40, DV50, DV60, DV80, DV90, DV100, DV120, DV150, DH40, DH50, DH60, DH80,
DH90, DH100, DH120, and DH150. Calibration factors at these points may be normalized to either 20°C
or 22°C, as specified by the customer.
Calibration Accuracy
NIST traceable: NIST traceable reference chambers are accurate to within ± 1% at each beam quality.
Matching between the reference and unknown chamber is accurate to ± 1%. Thus, NIST traceable
calibrations are accurate to within ± 2%.
PTB traceable: PTB traceable reference chambers are accurate to within ± 1.5% at each beam quality.
Matching between the reference and unknown chamber is accurate to ± 1%. Thus, PTB traceable
calibrations are accurate to within ± 2.5%.
Calibration Verification
NIST traceable: For NIST traceable calibrations, a chamber will be reported to be outside of its
calibration accuracy specification when a new calibration value differs from the old calibration value by
more than ± 4%. This includes the ± 2% accuracy specification plus ± 1% for the verification reference
plus ± 1% for the verification match.
PTB traceable: For PTB traceable calibrations, a chamber will be reported to be outside of its
calibration accuracy specification when a new calibration value differs from the old calibration value by
more than ± 5%. This includes the ± 2.5% accuracy specification plus ± 1.5% for the verification
reference plus ± 1% for the verification match.