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Ionising radiation

Environmental Radioactivity - Medicine - Occupational Radiation Protection - Nuclear Hazards Defence

Ionisierende Strahlung

Services for measuring devices

The Federal Office for Radiation Protection's (BfS) calibration laboratory (DAkkS number: D-K-15063-01-00) offers the following services:

  • Calibration of active measurement systems for radon-222 and short-lived progenies,
  • Calibration of passive, integrating measurement systems for radon-222,
  • Test of metrological properties of measurement devices and
  • testing of measurement methods.

Accreditation according to DIN EN ISO/IEC 17025 by the German Accreditation Body DAkkS.

Radon calibrating laboratory

Elisabeth Foerster
Head of Radon Calibration Service Laboratory
Quality management representative
Phone: +49 (0)3018 333 4221

Dr. Martin Dubslaff
Deputy Head of Radon Calibration
Service Laboratory
Phone: +49 (0)3018 333 4223

Bundesamt für Strahlenschutz
Fachgebiet SW 1.3
Köpenicker Allee 120-130
10318 Berlin
Deutschland

cal-radon@bfs.de

Fax: +49 (0)3018 333 4215

1. Calibration of active measurement systems for radon-222 and short-lived progenies

The BfS Radon Calibration Laboratory is accredited according to norm DIN EN ISO/IEC 17025 for the measurands:

  • Activity concentration of radon-222 in air (CRn) and
  • Potential alpha-energy concentration of the short-lived radon-222 progenies (polonium-218; lead-214; bismuth-214) in air volume (Cp).

The measurands are traced back to the national standard at the German Metrology Institute Physikalisch-Technische Bundesanstalt (PTB). The best measurement uncertainty, which can be achieved during calibrations, is assigned in the following table according to the measurement ranges. The calibration is done by comparing the displayed value of the device under test with the reference value of the calibration laboratory. For this purpose, the system under test is exposed within closed containers, in which a reference atmosphere is adjusted with defined values of the measurand and potential influencing factors.

Measurands, measurand ranges, and best measurement uncertainty
MeasurandRange of the measurandbest measurement
uncertainty of the reference
measurement*

Activity concentration of
Radon-222 in air
CRn

50 to < 1,000 Becquerel per cubic meter12 per cent
1,000 to < 10,000 Becquerel per cubic meter7 per cent
10,000 to < 100,000 Becquerel per cubic meter6 per cent

Potential alpha-energy
concentration of short-lived
radon-222-progenies
Cp

2 to < 40 mega-electronvolts per cubic centimeter
(3.2*10-7 to < 6.4*10-6 joule per cubic meter)
10 per cent
40 to < 400 mega-electronvolts per cubic centimeter
(6.4*10-6 to < 6.4 10-5 joule per cubic meter)
6 per cent
400 bis 4.000 Megaelektronenvolt pro Kubikzentimeter
(6,4*10-5 bis 6,4*10-4 Joule pro Kubikmeter)
6 per cent

* The extended relative measurement uncertainty is indicated, which is resulting from the standard uncertainty of measurement multiplied with a coverage factor k=2. It has been determined in accordance with DAkkS-DKD-3 "Angabe der Messunsicherheit bei Kalibrierungen", Deutsche Akkreditierungsstelle GmbH, Braunschweig, 2010 - German translation of publication EAL-R2 "Expression of the Uncertainty of Measurement in Calibration". The conventional true value of the measurement quantity lies in the dedicated range of values with 95 per cent probability.

The charges for standard calibration service are listed in the following table. For any other procedures the charges shall be based on time and effort and will be communicated to the customer in advance. No value added tax is charged for all services.

Standard charges for calibration service
Calibration procedure MeasurandNumber of
calibration points
Number of devicesCharge for calibration service
including calibration certificate
according to accreditation
Calibration of active
devices measuring
radon-222 progenies
(except for devices of
type "Grubenradiometer")
Cp31767.00 euros
Calibration of devices
of type
"Grubenradiometer"
Cp31373.00 euros
Calibration of active
devices measuring
radon-222
CRn31circa 560.00 euros*)

*) Charge shall be based on time and effort.

2. Calibration of passive, integrating measurement systems for radon-222

The measurand under calibration is the exposure E as mathematical product of the mean radon-222 activity concentration CRn and the exposure duration t. The passive measurement systems will be exposed in a reference atmosphere within a calibration container over a defined time period. Exposure duration and mean radon-222 concentration will be chosen to meet the exposure value requested by the customer. The radon-222 activity concentration, monitored by working standards, will be kept constant to a large extend over the exposure period and can be adjusted to values between 0.4 and 45 kilobecquerel per cubic meter.

Measurement range: 30 to 20,000 kilobecquerel per cubic meter times hours

Best measurement uncertainty
(twice the standard measurement uncertainty , 2σ): ± 7 per cent

The charge for standard calibration service is listed in the following table. For any other procedures the calculation shall be based on time and effort and will be communicated to the customer in advance. No value added tax is charged for all services.

Charges for standard calibration service for passive, integrating measurement systems for radon-222
Calibration procedureMeasurandNumber of
calibration points
Charge for calibration service
including calibration certificate
according to accreditation
Calibration service
for passive,
integrating measurement
systems for
radon-222
E *)3690,00 euros

*) Exposure E [in kilobecquerel-hours per cubic meter] is the mathematical product from the mean radon-222 activity concentration CRn and exposure duration t.


3. Test of metrological properties of measurement devices

Examinations to check the metrological properties and the impact of several external parameters on the indication of devices measuring radon-222 and its progenies shall be performed on request. The charges for these examinations shall be calculated on time and effort base.

4. Test of measurement methods

Examinations of methods for the measurement of radon-222 and its progenies shall be performed on request. The charges for these examinations shall be calculated on time and effort base.

State of 2016.01.25

© Bundesamt für Strahlenschutz