Radon survey in Greece—risk assesment

Nikolopoulos, Dimitrios; Louizï, A.; Koukouliou, V.; Serefoglou, A.; Georgiou, Evangelos; Ntalles, K; Proukakis, C.

doi:10.1016/s0265-931x(02)00026-7

Cited by 30 publications

(27 citation statements)

References 13 publications

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“…This trend is mainly attributed to the higher convective flow of soil gas into the ground. Similar results are also reported by other investigators in Greece (Kritidis et al, 1994;Ioannides et al, 2000;Nikolopoulos et al, 2002;Papaefthymiou et al, 2003). Indoor radon concentrations in the houses of Ptolemais were also classified according to the year of building construction.…”

Section: Indoor Radonsupporting

confidence: 87%

“…The values found in this survey are somewhat lower than the arithmetic mean value of 73 Bq m À3 and the geometric mean of 52 Bq m À3 given in UNSCEAR (2000) for Greece. Additionally, in a relatively large radon survey in 1277 dwellings (734 locations) in Greece, carried out by Nikolopoulos et al (2002), an arithmetic mean of 55 Bq m À3 and a geometric mean of 44 Bq m À3 were found. These values agree well with those found in this survey.…”

Section: Indoor Radonmentioning

confidence: 97%

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Natural radioactivity measurements in the city of Ptolemais (Northern Greece)

Psichoudaki

Papaefthymiou

2008

Journal of Environmental Radioactivity

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Section: Indoor Radonsupporting

confidence: 87%

Section: Indoor Radonmentioning

confidence: 97%

Natural radioactivity measurements in the city of Ptolemais (Northern Greece)

Psichoudaki

Papaefthymiou

2008

Journal of Environmental Radioactivity

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“…Largescale radon surveys have been performed in many countries (1) . In Greece, the relatively larger radon survey (2) has been carried out from 1995 to 1998, using etched track detectors in 1277 dwellings. According to the results obtained, it was found that only a small percentage of dwellings appeared to have annual average radon levels >400 Bq m À3 , which is the action level proposed by the European Union.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous measurements of indoor radon, radon–thoron progeny and high-resolution gamma spectrometry in Greek dwellings

Clouvas

Xanthos

Antonopoulos-Domis

2006

Radiation Protection Dosimetry

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Simultaneous indoor radon, radon-thoron progeny and high-resolution in situ gamma spectrometry measurements, with portable high-purity Ge detector were performed in 26 dwellings of Thessaloniki, the second largest town of Greece, during . The maximum measured value of radon gas concentration is 516 Bq m À3 . The comparison between the radon gas measurements, performed with AlphaGUARD and short-term electret ionisation chamber, shows very good agreement, taking into account the relative short time period of the measurement and the relative low radon gas concentration. Radon and thoron progeny were measured with a SILENA (model 4s) instrument. From the radon and radon progeny measurements, the equilibrium factor F could be deduced. Most of the measurements of the equilibrium factor are within the range 0.4-0.5. The mean value of the equilibrium factor F is 0.49 AE 0.10, i.e. close to the typical value of 0.4 adopted by UNSCEAR. The mean equilibrium equivalent thoron concentration measured in the 26 dwellings is EEC thoron ¼ 1.38 AE 0.79 Bq m À3 . The mean equilibrium equivalent thoron to radon ratio concentration, measured in the 26 dwellings, is 0.1 AE 0.06. The mean total absorbed dose rate in air, owing to gamma radiation, is 58 AE 12 nGy h À1 . The contribution of the different radionuclides to the total indoor gamma dose rate in air is 38% due to 40 K, 36% due to thorium series and 26% due to uranium series. The annual effective dose, due to the different source terms (radon, thoron and external gamma radiation), is 1.05, 0.39 and 0.28 mSv, respectively.

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“…It is also very significant that almost all values of the Spearman's correlation coefficients were successive (r 2 > 0.95), namely they corresponded to a very linear log-log R/S fit. Figure 2 presents a typical case of radon concentrations often observed in Greek apartment dwellings [29,30]. Measurements in this dwelling (D2) spanned approximately four days.…”

Section: Hurst Exponentmentioning

confidence: 99%

“…It should be noted as well, that lumping generates H -histograms rather than H -profiles. For certain types of long-memory analysis, lumping is considered favorable [28,29,31] mainly because lumping renders to non-overlapping signal's areas. This fact is advantageous for lowdeviating segments of the time-series.…”

Section: Hurst Exponentmentioning

confidence: 99%

Hurst Exponent Analysis of Indoor Radon Profiles of Greek Apartment Dwellings

Nikolopoulos¹

2014

2161-0398

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Radon and progeny ( 218 Po, 214 Pb, 214 Bi and 214 Po) are important indoor radioactive air pollutants with impact to humans. Radon is an inert gas that enters buildings from outdoor air, water and soil, especially via gaps around pipes and cables and through cracks in floors. Indoors, radon progeny remain free, or attach to indoor aerosols dust and water droplets. Hence, inhalable indoor radioactive mixtures are created which enter human lungs and irradiate tissues. The radiation exposure depends on several parameters some of which are the building characteristics, local geology, breathing rate and others.This work aimed to estimate Hurst exponents (H) of time-evolving radon signals of Greek apartment dwellings. The signals were collected with Alpha Guard Pro and include at least 24 hours of measurements in each dwelling. Hurst exponents were calculated by the R/S method through sliding on overlapping windows and lumping on nonoverlapping sequential windows. The scope was to identify whether radon dynamics are governed by persistent, antipersistent behavior or if these are uncorrelated.Most signals presented significant long-memory segments with important persistent sub-segments.

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Radon survey in Greece—risk assesment

Cited by 30 publications

References 13 publications

Natural radioactivity measurements in the city of Ptolemais (Northern Greece)

Natural radioactivity measurements in the city of Ptolemais (Northern Greece)

Simultaneous measurements of indoor radon, radon–thoron progeny and high-resolution gamma spectrometry in Greek dwellings

Hurst Exponent Analysis of Indoor Radon Profiles of Greek Apartment Dwellings

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