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Selected statistical problems in spatial evaluation of Rn related variables

100%

Friedmann H. , Bossew P.

tom Vol. 55, No. 4

429-432

Since indoor radon is considered a potential hazard to health, Rn prevention and mitigation are necessary in certain areas. In this article we address the issues of mapping support and resolution, and conceptually discuss two common ways of generating maps from given information. Further, a short overview is given on the sources of uncertainties which are inevitably associated to every estimate and how to treat them. Finally, some possibilities of generating classified risk indices are outlined, since it is most often necessary to classify regions by estimated hazard.

Results of radon CR-39 detectors exposed in schools due two different long-term periods

70%

Stojanovska Z. , Boev B. , Zunic Z. S. , Bossew P. , Jovevska S.

Nukleonika

2016

tom Vol. 61, No. 3

385--389

The paper deals with the recent survey of indoor radon (Rn) results in schools, where paired CR-39 detectors were simultaneously exposed to different long-term periods, i.e., one detector was exposed during the whole year and the other one in the period of the school year duration. To be able to compare the results obtained, for its analysis, the relative bias and U tests were used. It was found that there are no systematic differences between the results, which points that the exposure of the detector during summer vacations did not affect the estimated average annual radon concentration. The paired results were modelled by a linear function, giving an extremely high coeffi cient of determination R2 = 0.99.

Dose assessment from the exposure to attached and unattached progeny of radon and thoron in indoor environment

70%

Prasad M. , Bossew P. , Kumar G. A. , Mishra R. , Ramola R. C.

Acta Geophysica

2018

tom Vol. 66, no. 5

1187--1194

The radiation dose from the exposure to radon (222Rn) and thoron (220Rn) is mainly contributed by their progeny, not by the gases themselves. This study aims to investigate the health risk associated with the internal exposure to attached and unattached progeny of 222Rn and220Rn in the indoor environment of Garhwal Himalaya, India. For this purpose, the passive measurements of attached and unattached progeny levels of 222Rn and 220Rn were performed in Garhwal Himalaya, India using nuclear track detector based recently developed progeny sensors. The measured values of unattached and total progeny concentrations were used to estimate the unattached fractions and annual effective doses. The annual mean unattached fractions of 222Rn and 220Rn progeny were found to be 0.15 ± 0.04 and 0.17 ± 0.05, respectively. The estimated values of the annual effective doses were found to be 3.4 ± 1.9 mSv/y and 0.7 ± 0.4 mSv/y due to the progeny of 222Rn and 220Rn, respectively. The methodology and results obtained are discussed in details.

The indoor radon survey in Serbian schools: can it reflect also the general population exposure?

41%

Žunić Z. S. , Bossew P. , Veselinović N. , Bochicchio F. , Carelli V. , Vaupotič J. , Čuknić O. , Simović R. , Vojinović Z. , Kisić D. , Tollefsen T.

tom Vol. 55, No. 4

419-427

A systematic indoor radon survey in elementary schools of Serbia is underway since 2008. Its current first phase covers all elementary schools in predominantly rural communities of Southern Serbia. The design of the survey, its implementation and the current state of its realization is shortly described. Part of this paper is devoted to discussion of the question if this survey could produce results representative also of the radon concentration in dwellings and of radon exposure of the general population, discussing some statistical aspects of representativity which arose during the work, namely, if the implementation leads to an unbiased estimate of the targeted quantities.