Wyniki wyszukiwania - BazTech

1

Remarks to history of radon activity concentration metrology

Otahal Petr P. S., Burian Ivo

Nukleonika

|

2020

|

Vol. 65, No. 1

45--49

EN

The radon issue has been known worldwide for dozens of years. Many scientifi c (ICRP Publication No. 137), technical (ICRU Report No. 88), and legislative (Council Directive 2013/59/EURATOM (EU-BSS)) documents have been published in the last decade. More and more attention is being paid to precise quantification to determine the concentration and consequent effects of various pollutants on human health worldwide. The quality of measurement and the variety of measurement techniques increase the need to unify measurement procedures and metrology continuity. Countries around the world are beginning to unify metrological procedures for determining different quantities based on international recommendations and standards. Not only for these reasons, it became more actual a need for more accurate radon activity concentration measurement and radon metrology unification. This paper summarizes the main remarks and technical aspects to the historical development of radon metrology.

2

Metrological aspects of international intercomparison of passive radon detectors under field conditions in Marie Curie’s tunnel in Lurisia

Cardellini F., Chiaberto E., Garlati L., Giuffrida D., Leonardi F., Magnoni M., Minchillo G., Prandstatter A., Serena E., Trevisi R., Tripodi R., Veschetti M.

Nukleonika

|

2016

|

Vol. 61, No. 3

257--261

EN

In 2014, an intercomparison exercise of passive radon detectors under field conditions in the Marie Curie’s tunnel belonging to the Lurisia spas complex (Lurisia, Piedmont, Italy) has been held. Radon activity concentration in the tunnel was measured with six radon active monitors, previously calibrated at ENEA-INMRI facilities. In the present paper, a synthesis of the metrological aspects of the intercomparison is given. Indeed particular attention was paid to metrological characterization of radon monitors and their response upon ambient conditions. Correction factors have been defined to be applied when measurements are performed in severe environmental conditions. In particular, it has been found that monitors are particularly sensitive to the effect of air density: the AlphaGUARD (AG-SAPHYMO, GmbH) effi ciency decreases with the air density, while for the MR1 PLUS (Tesys, Italy), the opposite applies. When the reference monitors were placed into the Marie Curie’s tunnel, to the recorded average radon concentrations correction factors were applied. After the correction the difference between data coming from AG and MR1 PLUS is within the 1.7%.

3

Main results of the international intercomparison of passive radon detectors under field conditions in Marie Curie’s tunnel in Lurisia (Italy)

Cardellini F., Chiaberto E., Garlati L., Giuffrida D., Leonardi F., Magnoni M., Minchillo G., Prandstatter A., Serena E., Trevisi R., Tripodi R., Veschetti M.

Nukleonika

|

2016

|

Vol. 61, No. 3

251--256

EN

In recent years a large number of radon intercomparison exercises has been organized; most of them took place in radon chambers, in reference atmosphere of the parameter to control (i.e. radon gas) under temperature, humidity and atmospheric pressure stable conditions. In 2014, in the tunnel belonging to the Lurisia spas complex (Lurisia, Piedmont, Italy), with natural high concentrations of uranium and radon gas, an intercomparison exercise has been held to give to radon measurement services and laboratories the possibility to test their passive systems under field conditions, which are less controlled and much more challenging. The response of laboratories was very positive: 46 participants from 10 European countries and 3 non-European countries. Generally about 80% of results of participants were considered acceptable even if it was observed a global trend of a substantial underestimation of the actual radon concentration.

4

Intercomparison of radon CR-39 detector systems conducted in CLOR's calibration chamber

Mamont-Cieśla K., Stawarz O., Karpińska M., Kapała J., Kozak K., Grządziel D., Chałupnik S., Chmielewska I., Olszewski J., Przylibski T. A., Żebrowski A.

Nukleonika

|

2010

|

Vol. 55, No. 4

589-593

EN

Six radon laboratories, which perform indoor radon measurements to jointly investigate temporal variations of radon concentration in houses in a couple of regions in Poland, participated in the intercomparison exercise. There are involved three commercially available Hungarian RadoSys systems and four own laboratory methods. All of them are based on the etched-track CR-39 detectors. The intercomparison was conducted in a calibration laboratory of the Central Laboratory for Radiological Protection (CLOR), Warsaw, Poland, accredited by the Polish Center for Accreditation (previously AP 101, at present AP 057). Comparison measurements were performed during three expositions in the CLOR’s radon calibration chamber under controlled normal climatic conditions and steady radon concentration. The results were referred to the value of the radon concentration determined by AlphaGUARD monitor traceable to the primary 222Rn standard in Physikalisch-Technische Bundesanstalt (PTB), Braunchweig, Germany. The mean performance ratio defined as a ratio of the reference to participant’s result range from 0.88 to 1.31.

5

Badanie spójności wyników interkomparacji wzorców indukcyjności własnej

Skubis T., Met A., Musioł K.

Zeszyty Naukowe Politechniki Rzeszowskiej. Elektrotechnika

|

2006

|

z. 29 [233]

243-250

PL

W artykule przedstawiono problematykę spójności wyników pomiaru różnic indukcyjności i rezystancji wzorców indukcyjności własnej wchodzących w skład pewnej grupy. Przedstawiono wyniki badań spójności wyników komparacji wzorców indukcyjności wykorzystywanych w laboratoriach państwowych odtwarzających jednostki miar. Do badań wykorzystano precyzyjny komparator wzorców indukcyjności KWL3 zaprojektowany w Instytucie Metrologii i Automatyki Elektrotechnicznej Politechniki Śląskiej a zastosowany w Physikalisch-Technische Bundesanstalt w Brauschweigu (Niemcy).

EN

Analysis of coherence of difference result measurements of inductance and resistance between self-inductance standards is shown in the paper. Results of coherence measurements for standards used by National Metrologys Institutes are presented. For high accurate measurements of inductance and resistance differences a precise transformer bridge KWL3 was used. The instrument was designed in Institute of Measurements and Automation Control in Silesian University of Technology (Gliwice, Poland) and introduced for usage in Physikalisch-Technische Bundesanstalt (Brauschweig, Germany) and in Central Office of Measures (Warsaw, Poland).

6

Precision of 14C dating in Gliwice Radiocarbon Laboratory. FIRI programme

Pazdur A., Fogtman M., Michczyński A., Pawlyta J.

Geochronometria

|

2003

|

Vol. 22

27-40

EN

In this paper the precision and accuracy of radiocarbon dating in Gliwice Radiocarbon Laboratory on the background of intercomparision programs is discussed. Here are briefly presented results of individual comparisons between laboratories from eight countries and three international intercomparison programmes: ISC Programme (1986), TIRI Programme (1994) and FIRI Programme (1999). Moreover the short description of Gliwice Radiocarbon Laboratory is presented. The main stress is laid on the description of FIRI Programme – types of samples included in Programme and methods of calculation of consensus values, but first of all the participation of our Laboratory in the programme is presented: pretreatment procedures of samples, results obtained in Gliwice and statistical analysis of these results. The most important conclusion, which may be drawn from this paper, is that Gliwice Radiocarbon Laboratory dating results are not biased by systematic error.