Contact
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Head of Radon Calibration Service Laboratory
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Dr. Volkmar Schmidt
Phone: +49 (0)3018 333 4219
Fax: +49 (0)3018 333 4215
Email: vschmidt@bfs.de
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Deputy Head of Radon Calibration
Service Laboratory
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Helmut Buchröder
Phone: +49 (0)3018 333 4213
Fax: +49 (0)3018 333 4215
Email: hbuchroeder@bfs.de
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Quality management representative
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Elisabeth Foerster
Phone: +49 (0)3018 333 4221
Fax: +49 (0)3018 333 4215
Email: efoerster@bfs.de
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Address
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Bundesamt für Strahlenschutz
Fachgebiet SW 1.3
Köpenicker Allee 120-130
10318 Berlin
Germany
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The accredited Radon Calibration Service Laboratory 1 of the Federal Office for Radiation Protection offers:
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 (Po-218; Pb-214; Bi-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 table "Measurands, measurand ranges, and best measurement uncertainty" 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
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Measurand |
Range of the measurand |
Best measurement
uncertainty of the reference
measurement* |
Activity concentration of
Rn-222 in air
CRn
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|---|
| 50 Bq/m³ to 1000 Bq/m³ |
12 % |
| 1000 Bq/m³ to 10000 Bq/m³ |
7 % |
| 10000 Bq/m³ to 100000 Bq/m³ |
6 % |
Potential alpha-energy
concentration of short-lived
Radon-222-progenies
Cp |
|---|
2 MeV/cm³ to 40 MeV/cm³
(3.2 10-7 J/m³ to 6.4 10-6 J/m³) |
14 % |
40 MeV/cm³ to 400 MeV/cm³
(6.4 10-6 J/m³ to 6.4 10-5 J/m³)
|
12 % |
400 MeV/cm³ to 4000 MeV/cm³
(6.4 10-5 J/m³ to 6.4 10-4 J/m³)
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12 % |
* 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% probability.
The charges for standard calibration service are listed in table "Standard charges for calibration service". For any other procedures the charges shall be based on time and effort and will be communicated to the customer in advance. No VAT is charged for all services.
Standard charges for calibration service |
Calibration procedure |
Measurand |
Number of
calibration points |
Number of devices |
Charge for calibration service
including calibration certificate
according to accreditation |
Calibration of active
devices measuring
radon-222 progenies
(except for devices of
type "Grubenradiometer") |
Cp |
3 |
1 |
767.00 € |
Calibration of devices
of type
"Grubenradiometern" |
Cp |
3 |
1 |
373.00 € |
Calibration of active
devices measuring
radon-222 |
CRn |
3 |
1 |
ca. 560.00 € *) |
*) 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 kBq/m³ and 45 kBq/m³.
Measurement range: 30 kBq•h/m³ - 20000 kBq•h/m³
Best measurement uncertainty
(twice the standard measurement uncertainty
, 2σ): ± 7 %
The charge for standard calibration service is listed in table "Charges for standard calibration service for passive, integrating measurement systems for radon-222". For any other procedures the calculation shall be based on time and effort and will be communicated to the customer in advance. No VAT is charged for all services.
Charges for standard calibration service for passive, integrating measurement systems for radon-222 |
Calibration procedure |
Measurand |
Number of
calibration points |
Charge for calibration service
including calibration certificate
according to accreditation |
Calibration service
for passive,
integrating measurement
systems for
radon-222 |
E *) |
3 |
690.00 € |
*) Exposure E [kBq•h/m³] 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.
1Accreditation according to DIN EN ISO/IEC 17025 from 1998 until 8th March 2011 by the German Calibration Service DKD, since 9th March 2011 by the German Accreditation Body DAkkS.
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