COOMET.RI(II)-S1.Rn-222 (169/UA/98): Rn-222 volume activity comparison

Abstract

According to a first program, a supplementary comparison of Rn-222 volume activity was drawn up as a bilateral supplementary comparison between NSC 'Institute of Metrology', Ukraine, and VNIIFTRI, Russia. It took place in March 2005.In April 2005, at the 5th meeting of COOMET held in Braunschweig (Germany), representatives of these institutes exchanged data which showed the comparability of the national standards of Ukraine and Russia for the check points. During the discussion of the procedure some other institutes decided to join the comparison program, which was extended to BelGIM (Belarus), PTB (Germany), VNIIM (Russia) and RMTC (Latvia). The national standards of volume activity of radon-222 were thus calibrated using one standard radon radiometer as the transfer standard. Results are shown in the Final Report of the comparison.Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by COOMET, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).

Development and characterization of scintillation based detectors for the use in radiological early warning networks

“…The uncertainty budget of the photon fields in UDO II is described in [9]. All dose values reported in this paper are expressed in H* (10), ambient dose equivalent. In Europe, the operational quantity for area dose measurements, implemented by the council directive 2013/59/EURATOM, is H* (10), defined in [11]: "The ambient dose equivalent, H* (10), at a point in a radiation field is the dose equivalent that would be produced by the corresponding expanded and aligned field in the ICRU sphere at a depth of 10 mm on the radius opposing the direction of the aligned field."…”

“…The spectrometers were exposed to radon progeny atmospheres in the radon chamber of PTB [10]. This chamber has a volume of about 24 m 3 , which allows the simultaneous exposure of all four detectors and of a reference dose rate instrument.…”

“…The photo peak efficiencies of the 662 keV peaks of 137 Cs in table 3 are calculated by using the fluence to dose conversion factors defined in [13]. The fluence is derived form the well Photo peak efficiency in % 662 keV ( 137 Cs) 13.3 ± 0.5% 12.8 ± 0.5% 13.9 ± 0.6% 20.8 ± 0.8% known H* (10) values at the reference point of PTB's underground calibration facility. Although the photon fields are collimated a small contribution of scattered photons is present.…”

“…Net photo peak area in counts per H*(10), ambient dose equivalent, of each detector at different energies (the standard uncertainties are listed with the expansion factor k = 1).…”