Variation of radon (Rn) progeny concentrations in outdoor air as a function of time, temperature and relative humidity

The concentration of radon gas in air-conditioned indoor Air quality can increase the potential of lung cancer

“…Rooms with gypsum ceilings increase radiation doses and air-conditioned rooms can accumulate radiation doses evenly in the room. The results of this study support the recommendations published by UNSCEAR in 2000, which provide an overview that the levels of radon gas in the house are quite high, especially in closed rooms or inadequate ventilation, such as basements and enclosed spaces that use AC systems as coolers [7,9].…”

“…The average lighting is 118.18 -143.75 Lux is the room lighting that is fulfilled according to the permitted limit where the lighting of a minimum room is 100 Lux. Average noise 47.27 -51.60 dB still meets the standard maximum hearing threshold is 85 dB [7].…”

Radon Calibration System

“…As shown in Figure 5a, the equilibrium factor tends to decrease as the temperature increases (temperature range of 20-50 C for 24 h) and this is due to the temperature impact on the equilibrium factor by two chief causes: (1) the temperature reduces the equilibrium factor by effects on the radon emanation rate and (2) the temperature rises the equilibrium factor by affecting the number of radon daughters in the air [52,53]. Also Figure 5b shows that the equilibrium factor at 20 C is equivalent to 2.2 times the coefficient of equilibrium at 50 C and 1.5 times the coefficient of equilibrium at 32 C. Also, the influence of the flow rate through irradiation on the equilibrium factor between radon and its daughters was obvious.…”

Analysis of temperature influences on the amplitude–frequency characteristics of Rn gas concentration

“…Analysis of the literature (Asada, 1982;Atkinson, 1981;Bolt, 1993;Clements and Wilkening, 1974;Cothern, 1987;Dowell et al, 1991;Ganor et al, 1991;Garavaglia et al, 1999;Gaso et al, 1994;Hafez and Hussein, 2001;Hoyos et al, 1998;Lee and Yu, 2000;Mamane et al, 1980;Mishel, 1987;Maeda and Yoshida, 1990;Monnin and Seidel, 1992;Khan, 1993;Li et al, 1992;Richon et al, 2005;Scott, 1992;Sanchez-Moral et al, 1999;Segovia et al, 1995;Semi-Zade, 1978, 1992Singh et al, 2005;Stranden et al, 1984;Virk and Sing, 1993;Washington and Rose, 1990;Wakita, 1996;Wilkening and Watkins, 1976;Zmazek et al, 2005) allowed us to conclude that the observed total concentration of Rn gas (F sum ) can be presented as a sum of eight factors. Every factor has a separate origin and may create a wide range of anomalies .…”