Radon-222 in Brazil: an outline of indoor and outdoor measurements

Magalhães, M.H.; Amaral, E.C.S.; Sachett, I.; Rochedo, E.R.R.

doi:10.1016/s0265-931x(02)00175-3

Cited by 67 publications

(35 citation statements)

References 7 publications

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“…In summer, the higher rate of vertical mixing and dispersions lift the aerosols to higher altitudes resulting in a decrease in the concentration near to the ground (24) . Magalhaes et al (25) have observed a two order of magnitude of variability, with a maximum of 50 Bq m 23 in winter and a minimum of 0.5 Bq m 23 in summer months. In addition, radon exhalation rate also decreases during monsoon as soil pores get filled by water and hence, resulting in lower concentration (26) of 222 Rn and 220 Rn.…”

Section: Seasonal Variations and Dose Ratesmentioning

confidence: 97%

Indoor 222Rn and 220Rn concentrations and doses in Bangalore, India

L.A.Sathish¹,

Nagaraja

Ramachandran

2012

Radiation Protection Dosimetry

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Section: Seasonal Variations and Dose Ratesmentioning

confidence: 97%

Indoor 222Rn and 220Rn concentrations and doses in Bangalore, India

L.A.Sathish¹,

Nagaraja

Ramachandran

2012

Radiation Protection Dosimetry

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“…ture, precipitation, and snow cover occurrence) was presented in the studies by [17][18][19][20][21][22][23][24].…”

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confidence: 99%

Soil heat flux and air temperature as factors of radon (Rn-222) concentration in the near-ground air layer

Podstawczyńska

Pawlak

2016

Nukleonika

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IntroductionRadon (Rn-222), a radioactive gas with a half--life of 3.82 days, is emitted naturally (0.72-1.2 atoms·cm −2 ·s −1 ) from ice-free, unsaturated terrestrial surfaces [1,2]. The Rn-222 concentration in the near-surface air layer is undoubtedly strongly infl uenced by local conditions, which are connected with the environment of the gas emissions to the atmosphere (inter alia: geological formation, soil characteristics -radium content, permeability and porosity, temperature vertical profi le, soil heat fl ux, and humidity) and microclimatic conditions occurring in the near-ground air layer [3]. Research on Rn-222 in the context of meteorology dates back to the 1920s [4] and has developed intensively since the 1960s. In most publications, Rn-222 has been used to study the atmosphere as a natural tracer of the processes of transport and dispersion of gases [5][6][7][8][9][10][11]. Rn-222 has also been used as an indicator of vertical mixing processes resulting in the atmospheric stability regime [12][13][14][15][16][17]. The temporal variability of the Rn-222 concentration with reference to the meteorological variables (such as wind velocity and direction, atmospheric pressure, air tempera- Abstract. A unique, highly time-resolved, and synchronous three-year dataset of near-surface atmospheric radon-222 as well as soil heat fl ux and air temperature measurements at two sites (rural and urban) in Central Poland are investigated. The recognition of temporal variability of Rn-222 and selected meteorological variables in the urban and rural areas served to create two statistical models for estimation of this radionuclide concentration at 2 m a.g.l. The description of the relationships between the variables for individual months was established on the basis of an exponential function and an exponential function with time derivative of predictor to account for the hysteresis issue. The model with time derivative provided better results. The weakest fi tting of modelled data to empirical ones is observed for the winter months. During subsequent seasons, air temperature as well as QG-driven (soil heat fl ux) models exhibited very high agreement with the empirical data (MBE, RMSE, MAE, and 'index of agreement' by Willmott were used to evaluate the models). A restriction in the use of QG for Rn-222 concentration was observed only in winter in the case of snow cover occurrence, which reduces the daily QG variability.

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“…The mean radon concentration in Hamadan's dwellings, noted in this reconnaissance study, is relatively high when compared with the average global population-weighted radon concentration of about 40 Bq/m 3 indoors (Magalhaes et al, 2003). This may be due, in part, to the construction style of the majority of buildings in Hamadan, where the floor is covered with clay rather than concrete, together with the prevalence of older brick buildings.…”

Section: Discussionmentioning

confidence: 67%

A reconnaissance study of radon concentrations in Hamadan city, Iran

Gillmore

Jabarivasal

2010

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper presents results of a reconnaissance study that used CR-39 alpha track-etch detectors to measure radon concentrations in dwellings in Hamadan, western Iran, significantly, built on permeable alluvial fan deposits. The indoor radon levels recorded varied from 4 (i.e. below the lower limit of detection for the method) to 364 Bq/m 3 with a mean value of 108 Bq/m 3 which is 2.5 times the average global population-weighted indoor radon concentration -

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Radon-222 in Brazil: an outline of indoor and outdoor measurements

Cited by 67 publications

References 7 publications

Indoor 222Rn and 220Rn concentrations and doses in Bangalore, India

Indoor 222Rn and 220Rn concentrations and doses in Bangalore, India

Soil heat flux and air temperature as factors of radon (Rn-222) concentration in the near-ground air layer

A reconnaissance study of radon concentrations in Hamadan city, Iran

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