Synergisms of RN-222 reduction emanations with different thickness plaster from red brick

Radon (Rn-222) is noble gas formed by the decay of radium (Ra-226), which is one of the nuclides formed in the disintegration series from uranium (U-238). Radon has been considered the second leading cause of lung cancer and leading environmental cause of cancer mortality by the Environmental Protection Agency. The objectives of this research are to investigate the synergism of Rn-222 reduction emanations with three different thickness cements from red brick. Therefore, in this research we want to see whether the radon emanation will reduce by coating with different thickness of cement. In this research, Rn-222 concentrations have been measured with three different thickness layers of red brick by using Radon Sentinel Model 1030. The thickness range for every layer which is the first layer has 1.0 – 1.5 cm. For second layer thickness is 1.5 – 2.0 cm and third layer is 2.0 – 2.5 cm. The data collect for each layer is after 24 hours in 4 consecutive days with interval 1 hour. The average of Rn-222 concentration for three layer were found at 8.15 pCi/L, 5.73 pCi/L and 0.125 pCi/L. The red brick with thicker layer of cement has the lower Rn-222 concentration compare to red brick layer with thin layer of cement. Rn-222 concentration also influenced by ventilation rate, humidity, pressure and temperature even though it had been placed into prototype room to reduce this factors.