Synergisms of RN-222 reduction emanations with different thickness plaster from interlocking block

Radon is radioactive materials which exist in human surrounding and it dangerous to human and environment because it is tasteless, invisible, touchable colourless and odourless. It is a decay product of Ra-226 and ultimately of U-238, both of which are naturally contain in soil and rocks which produce from the Earth’s crust. Rn-222 originated from rock and soil which can enter any building through cracks, construction joint and also from materials that build it. Rn-222 also is a second lead lung cancer disease besides smoking because of the inhalation of radon gas in high concentration is dangerous that can affect the organ and tissue inside human body due to the alpha particles that contain in radon. So, the measurements of radon concentrations were done in prototype room at material laboratory, Universiti Malaysia Kelantan, Jeli due to the effect of hazard and the different thickness of plaster from interlocking block were chosen. In this research, Radon Sentinel 1030 Model was used to measure the radon concentrations thus investigate the radon emanation produce and effect from interlocking block with different plaster as well as to study the factor that influence radon emanation in environment. The different thickness of plaster which consist layer 1 with thickness (0.5 – 1.0) cm, layer 2 (1.0 – 1.5) cm and layer 3 (1.5 – 2.0) cm was placed in the prototype room with its measurement 40 cm height x 40 cm long x 40 cm wide to control the factors that can affect the radon produce. The research runs in four days per layer. Layer 1 has the most radon concentrations than layer 2 and layer 3. For layer 1, the maximum Rn-222 concentration detected is 0.2 pCi/L, for layer 2 is 0 and also for layer 3 is 0. Thickness of plaster play important rule that can affect to Rn-222 emanation. This is due to the alpha particle properties which are alpha particles has short travel distance and can blocked by sheet of paper. Environmental factors also can affect the emanation of Rn-222 such as humidity, temperature, and pressure. The result show less Rn-222 because of the brief monitoring. To get the better result, this research must run at least 6 month. At the nut shell, radiation properties, thickness of layer, environmental factors and time monitoring in this research can affect the emanation of Rn-222.