Experimental Study of the Response of Cup-type Radon Dosemeters

Nikolopoulos, Dimitrios; Louizï, A.; Petropoulos, N.P.; Simopoulos, S.E.; Proukakis, C.

doi:10.1093/oxfordjournals.rpd.a032681

Cited by 7 publications

(5 citation statements)

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“…It is noted that a residual of 1.6 inlog (C) is consistent with uncertainty σ C = 39.8 Bq⋅ m − 3 in predicted C values. This, according to the recording capabilities of the employed dosemeters [56], accompanies high C values, namely C values above the EU action limit of 200 Bq⋅ m − 3 . Moreover, the majority of predicted residuals were below 1.2.…”

Section: Resultsmentioning

confidence: 95%

Factors Affecting Indoor Radon Concentrations of Greek Dwellings through Multivariate Statistics - First Approach

Nikolopoulos¹

2014

J Phys Chem Biophys

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are the primary sources of radon in soil, with 222 Rn being dominant in rocks, soil, building materials, underground and surface waters [2] and set to be the most hazardous radionuclide. Radon (222 Rn) and its short-lived progeny (218 Po, 214 Po, 214 Bi, 214 Pb) are attached in dust and in water droplets creating radioactive aerosols, that inhaled via breathing and enter human lungs. Radon enters buildings through gaps around pipes or cables and through cracks in floors [3]. Primary studies have shown that radon is the second most dangerous cause of lung cancer after smoking. This happens when alpha particles emitted from radon progeny damage pulmonary epithelium [4-7]. Many studies have been made for the measurement of indoor radon concentrations in several countries [8-19]. Over the years, in Greece, indoor radon concentrations measurements, to our knowledge, are as follows: several small-scale [20-24], two middle-scale [3,25] and one large-scale [26]. Under the National Strategic Reference Framework (NSRF) "Thales" project of the Technological Education Institute of Piraeus and extending the aforementioned large scale radon survey; this paper addresses the grade of severity with witch factors influence indoor radon concentration levels. Similar studies in other countries have shown that indoor radon concentrations are higher at lower floor levels [27-30]. Moreover, recent studies indicate that radon emanation from building materials contributes significantly in indoor radon concentration in dwellings [31-33]. Results of current work may strengthen these considerations and additionally provide evidence for lack of correlation of other factors such as the "building walls contact" and "construction year" with radon concentrations.

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Section: Resultsmentioning

confidence: 95%

Factors Affecting Indoor Radon Concentrations of Greek Dwellings through Multivariate Statistics - First Approach

Nikolopoulos¹

2014

J Phys Chem Biophys

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“…The passive techniques employed a calibrated radon dosimeter 48,49 based on the CR-39 solid state nuclear track detector (SSNTD). To measure the radon concentration in soil, two dosimeters were installed and removed every week, near the soil gas unit at approximately 80 cm underground to minimise meteorological influences.…”

Section: Instrumentsmentioning

confidence: 99%

“…The removed dosimeters were immediately measured with standard techniques. 48,49 According to the measurement efficiency the lower limit of detection of radon in soil is equal to approximately 7000 Bq m À3 h. 48 The overall uncertainty of the estimation of the concentration of radon was below 10% at the 95% confidence interval (CI). 48,49…”

Section: Instrumentsmentioning

confidence: 99%

Environmental monitoring of radon in soil during a very seismically active period occurred in South West Greece

et al. 2012

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This paper focuses on the environmental monitoring of radon in soil as a potential trace gas in the search of earthquake precursors. The paper reports the following: (a) Pre-monitoring experiments. (b) Set-up of methods and devices. (c) Active and passive monitoring results concentrating on two extremely-strong radon anomalies (~ 500 kBq m(-3)). (e) Discussion regarding the employed ± 2σ technique for identifying radon disturbances. (f) Application of wavelet-power-spectrum fractal analysis for detecting power-law behaviour. The strong anomalies exhibited anti-persistent power-law-beta-values (b = (1.8 ± 0.2), b = (1.8 ± 0.3)) significantly higher than those of the baseline. Persistent b-values were also detected. The findings comply with a self-organised-critical pre-earthquake state. (h) Discussion on models that interpret the radon anomalies focusing on the recently-proposed asperity-model. (i) Application of a recent technique which showed that the two strong disturbances were proportional to the strain change. It was concluded that the strong radon disturbances may be linked to the strong earthquake of 8/6/2008, M = 6.5, occurred 29 km away from the installed instrumentation.

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“…x=a,u and i=1,2,3) was adopted. Presuming however only typical lowhumidity ambient room environments under a Jacobian [12,13,15] steady-state with complete mixing, Where q a is the symbol for the deposition rate of all attached progeny. Symbolising q u the deposition rate of all unattached progeny it follows from (9) that…”

Section: Theoretical and Experimental Techniques Theoretical Approachmentioning

confidence: 99%

“…Passive radon measurements within the Thalis Project are being conducted with a cup-type CR-39 dosimeter which was calibrated previously [15]. This cup-type dosimeter has well-established linear response to radon exposure.…”

mentioning

confidence: 99%

Response of CR-39 Polymer Radon-Sensors via Monte-Carlo Modelling and Measurements

Nikolopoulos¹,

Kottou²,

Petraki³

et al. 2014

J Phys Chem Biophys

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International studies of radon indoors and in workplaces have shown significant radiation dose burden of the general population due to inhalation of radon ( 222Rn) and its short-lived progeny ( 218Po, 214 Pb, 214 Bi, 214 Po). As far as atmospheric radon concerns, 222 Rn, is not necessarily in equilibrium with its short-lived progeny. For this reason, radon's equilibrium factor F was solved graphically as a function of the track density ratio R=T B /T R , namely of the ratio between the recordings of cup-type and bare CR-39 detectors. T B was computed through special Monte-Carlo codes which were implemented for the calculation of the efficiency of bare CR-39 polymers, regarding their ability in sensing the alpha

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Experimental Study of the Response of Cup-type Radon Dosemeters

Cited by 7 publications

References 0 publications

Factors Affecting Indoor Radon Concentrations of Greek Dwellings through Multivariate Statistics - First Approach

Factors Affecting Indoor Radon Concentrations of Greek Dwellings through Multivariate Statistics - First Approach

Environmental monitoring of radon in soil during a very seismically active period occurred in South West Greece

Response of CR-39 Polymer Radon-Sensors via Monte-Carlo Modelling and Measurements

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