Interkomparacija profesionalnih i kućnih radonskih uređaja

Abstract

U radu je prikazana interkomparacija između profesionalnih radonskih detektora: RTM1688-2, RAD7, RadonScout Professional i ugljenih kanistera kod kojih je data merna nesigurnost, jeftinijih detektora za kućnu upotrebu: 3 Corentium Home i ViewPlus i uređaja RadonEye koji je nešto između. Aktivni detektori su izlagani 7 dana u realnim uslovima u radnoj prostoriji Instituta za nuklearne nauke “Vinča”, dok su ugljeni kanistri u tom periodu izlagani 2 puta po 2 dana. Visok stepen Pearson-ove korelacije od 0,75 do 0,92, između RTM1688-2, RAD7, RadonScout Professional i RadonEye detektora koji su merili koncentracije radona na svakih sat vremena, ukazuje da pomenuta 4 detektora dobro prate varijaciju radona u zatvorenim prostorijama tokom vremena. Interkomparacija je vršena 2 puta u periodu od dva dana, kada su rezultati svih 9 detektora bili dostupni. Testom za autlajere je utvđeno da nema atipičnih rezultata merenja i svi detektori su iskorišćeni pri proceni robustne srednje vrednosti. Z - testom je utvrđeno da ne postoji statistički značajna razlika između srednje vrednosti koncentracije radona dobijene za svaki detektor ponaosob i referentne srednje vrednosti, i da se jeftini radonski uređaji za kućnu upotrebu mogu koristiti za merenje dvodnevne prosečne koncentracije radona.

In this paper intercomparison between different classes of radon devices is presented. For professional radon detectors were considered RTM1688-2, RAD7, RadonScout Professional and charcoal canisters, which gave measurement uncertainty, and cheaper detectors declared by producesr for domestic usage: 3 Corentium Home devices and one ViewPlus device and the RadonEye device which is something in between. The active detectors, that have sampling time set for 1 hour, were exposed for 7 days in real conditions in the working room of the Institute of Nuclear Sciences Vinča , while the charcoal canisters were exposed two times for 2 days within the same 7 days period. The high values of Pearson's correlation coefficient, ranging from 0.75 to 0.92, between the RTM1688-2, RAD7, RadonScout Professional and RadonEye detectors that measured hourly radon concentrations, indicate that all detectors nicely follow a radon diurnal (hourly) variation. The intercomparison was performed two times over a period of two days, when the results of all 9 detectors were available. The test for outliers found that there were no extreme measured values and thus all detectors were used in the estimation of the robust mean value. With the ζ and Z tests, it was determined that there is no statistically significant difference between the mean value of the radon concentration obtained for each individual detector and the reference mean value, concluding that low cost radon devices could be used for measurement of two days average radon concentration.