In the CMCs uncertainty statements, the notation Q[a, b] stands for the root-sum-square of the terms between brackets: Q[a, b] = [a 2 + b 2]1/2
Unless otherwise stated the expanded uncertainties given below correspond to k = 2 (at a 95 % level of confidence)
Austria, BEV (Bundesamt für Eich- und Vermessungswesen)
Items for defining ITS-90 , Temperature : -38.8344 °C to 29.7646 °C
Long-stem SPRT
Absolute expanded uncertainty : 1.5 mK
Comparison with fixed points
Ambient temperature : 23 °C
Approved on 17 January 2013
Institute service identifier : BEV/10
Items for defining ITS-90 , Temperature : 419.527 °C
Freezing point of Zinc
Absolute expanded uncertainty : 1.6 mK
Direct comparison
Aluminium powder bath
Approved on 20 May 2010
Institute service identifier : BEV/6
Items for defining ITS-90 , Temperature : 231.928 °C
Freezing point of Tin
Absolute expanded uncertainty : 1.4 mK
Direct comparison
Aluminium powder bath
Approved on 20 May 2010
Institute service identifier : BEV/5
Mass , Mass : 1 mg to 100 mg
Mass standard
Absolute expanded uncertainty : 0.5 µg to 0.7 µg
Comparison in air
Temperature : 18 °C to 23 °C
Relative humidity : 40 % to 60 %
Uncertainty scales with measurand level.
The volume of the mass standards is known.
Approved on 31 January 2018
Pressure , Absolute pressure : 5000 Pa to 1.20E5 Pa
Digital piston manometer
Absolute expanded uncertainty
0.5 + 4E-05p

p pressure in Pa

The uncertainty is expressed in Pa

Gas medium
Uncertainty values range from 0.7 Pa to 5.3 Pa
Approved on 21 October 2001
Pressure , Gauge pressure : 3500 Pa to 1.70E5 Pa
Pressure balance
Absolute expanded uncertainty
0.5 + 3E-05p

p pressure in Pa

The uncertainty is expressed in Pa

Gas medium
Uncertainty values range from 0.6 Pa to 6 Pa
Approved on 21 October 2001
Ionizing radiation
Activity per unit mass , Single nuclide solution : 8.00E5 Bq/g to 1.00E10 Bq/g
Relative expanded uncertainty 1.9 %
Well type ionization chamber, balance
Tc-99m, no further specifications
Reference standard : Secondary standard ionization chamber
Source of traceability : NPL (Bq), BEV (g)
Approved on 21 October 2001
Institute service identifier : EUR-RAD-BEV-2025
Ionizing radiation
Activity per unit mass , Single nuclide solution : 3.00E5 Bq/g to 1.00E10 Bq/g
Relative expanded uncertainty 1.6 %
Well type ionization chamber, balance
In-111, no further specifications
Reference standard : Secondary standard ionization chamber
Source of traceability : NPL (Bq), BEV (g)
Approved on 21 October 2001
Institute service identifier : EUR-RAD-BEV-2027
Ionizing radiation
Activity per unit mass , Single nuclide solution : 2.00E5 Bq/g to 1.00E10 Bq/g
Relative expanded uncertainty 1.5 %
Well type ionization chamber, balance
Zn-65, no further specifications
Reference standard : Secondary standard ionization chamber
Source of traceability : NPL (Bq), BEV (g)
Approved on 21 October 2001
Institute service identifier : EUR-RAD-BEV-2015
Ionizing radiation
Personal dose equivalent/rate, superficial , Dosemeter : 1.00E-6 Sv/h to 50 Sv/h
Relative expanded uncertainty 4 %
Conversion coefficient, irradiation in a calibrated field on ISO water slab phantom or PMMA rod phantom, substitution of the graphite cavity ionisation chamber
Co-60, ISO-4037, 42 TBq (31.12.2008), 50 GBq (31.12.2008), 3 GBq (31.12.2008), 0.4 GBq (31.12.2008), 1 m to 18 m SDD
Reference standard : Graphite cavity ionisation chamber
Source of traceability : BEV
Approved on 24 January 2012
Institute service identifier : EUR-RAD-BEV-1050
Ionizing radiation
Activity per unit mass , Single nuclide solution : 2.00E6 Bq/g to 1.00E10 Bq/g
Relative expanded uncertainty 2.2 %
Well type ionization chamber, balance
Hg-197, no further specifications
Reference standard : Secondary standard ionization chamber
Source of traceability : NPL (Bq), BEV (g)
Approved on 21 October 2001
Institute service identifier : EUR-RAD-BEV-2044
Ionizing radiation
Activity per unit mass , Single nuclide solution : 2.00E6 Bq/g to 1.00E10 Bq/g
Relative expanded uncertainty 1.7 %
Well type ionization chamber, balance
Re-188, no further specifications
Reference standard : Secondary standard ionization chamber
Source of traceability : NPL (Bq), BEV (g)
Approved on 21 October 2001
Institute service identifier : EUR-RAD-BEV-2052
Ionizing radiation
Personal dose equivalent/rate, penetrating , Dosemeter : 0.05 Sv/h to 5 Sv/h
Relative expanded uncertainty 5 %
Conversion coefficient, calibration on ISO water slab phantom against a calibrated monitor chamber free in air
X-ray, 50 kV to 420 kV, ISO-4037 High air-kerma rate Series, 60 kV to 300 kV, max. 30 mA
Reference standard : Free air parallel plate ionisation chamber
Source of traceability : BEV
Approved on 24 January 2012
Institute service identifier : EUR-RAD-BEV-1041
Ionizing radiation
Surface emission rate , Contamination monitors : 150 s-1 to 4000 s-1
Relative expanded uncertainty 4 %
Large area solid source
Sr-90/Y-90, rectangular, planar sources
Reference standard : Large area proportional counter
Source of traceability : OMH, PTB
Approved on 21 October 2001
Institute service identifier : EUR-RAD-BEV-2060
Ionizing radiation
Personal dose equivalent/rate, penetrating , Dosemeter : 0.05 Sv/h to 5 Sv/h
Relative expanded uncertainty 5 %
Conversion coefficient, calibration on ISO water slab phantom against a calibrated monitor chamber free in air
X-ray, 10 kV to 50 kV, ISO-4037 High air-kerma rate Series, 10 kV to 30 kV, max. 60 mA
Reference standard : Free air parallel plate ionisation chamber
Source of traceability : BEV
Approved on 24 January 2012
Institute service identifier : EUR-RAD-BEV-1040
Ionizing radiation
Personal dose equivalent/rate, penetrating , Dosemeter : 0.01 Sv/h to 1 Sv/h
Relative expanded uncertainty 5 %
Conversion coefficient, calibration on ISO water slab phantom against a calibrated monitor chamber free in air
X-ray, 50 kV to 420 kV, ISO-4037 Wide-spectrum Series, 60 kV to 300 kV, max. 30 mA
Reference standard : Free air parallel plate ionisation chamber
Source of traceability : BEV
Approved on 24 January 2012
Institute service identifier : EUR-RAD-BEV-1039
Ionizing radiation
Surface emission rate , Contamination monitors : 200 s-1 to 5000 s-1
Relative expanded uncertainty 4 %
Large area solid source
Tl-204, rectangular, planar sources
Reference standard : Large area proportional counter
Source of traceability : OMH, PTB
Approved on 21 October 2001
Institute service identifier : EUR-RAD-BEV-2061
Ionizing radiation
Kerma/rate , Dosemeter : 1.00E-6 Gy/s to 1.00E-4 Gy/s
Relative expanded uncertainty 0.8 %
Calibration against a calibrated monitor chamber free in air
X-ray, 50 kV to 420 kV, IEC 61267 RQA Series, 40 kV to 150 kV, max. 30 mA
Reference standard : Free air parallel plate ionisation chamber
Source of traceability : BEV
Approved on 24 January 2012
Institute service identifier : EUR-RAD-BEV-1015
Ionizing radiation
Activity per unit mass , Reference material : 1 Bq/g to 1000 Bq/g
Relative expanded uncertainty 1.5E1 %
Gamma ray spectrometer
Am-241, reference material, mixed gamma ray nuclides, matrix quartz sand
Reference standard : Gamma ray spectrometer
Source of traceability : OMH (Bq), BEV (g)
The following radionuclides are present in this reference material: Mn-54, Co-57, Co-60, Am-241, Cd-109, Ba-133, Cs-134, and Cs-137
Approved on 21 October 2001
Institute service identifier : EUR-RAD-BEV-2069
Ionizing radiation
Activity per unit mass , Reference material : 1 Bq/g to 1000 Bq/g
Relative expanded uncertainty 4 %
Gamma ray spectrometer
Ba-133, reference material, mixed gamma ray nuclides, matrix bentonite
Reference standard : Gamma ray spectrometer
Source of traceability : OMH (Bq), BEV (g)
The following radionuclides are present in this reference material: Mn-54, Co-57, Co-60, Am-241, Cd-109, Ba-133, Cs-134, and Cs-137
Approved on 21 October 2001
Institute service identifier : EUR-RAD-BEV-2068

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