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porosity
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radon is one type of radiation sources and it occurs naturally in environments. it is one of the radioactive gas and one of the contributors for lung cancer disease after smoking due to the emission of alpha particles. radon(rn-222) can be found in the common building materials such as the red bricks and it is derived from the decay process of uranium(u-238). it is form from the combination of sand, cement, and might be clay to form a bulk of bricks. these aggregates also consist amount of rn-222 concentration. people does not realize the existence of rn-222 emanates from red bricks. rn-222 emanates from the red bricks through the porosity and also the cracking line along the bricks. to prevent emanation of α-particles, rn-222 progenies from red bricks, a layer of plaster was applied. this plaster was then coated with selected coating which are jotun, nippon paint, and dulux. this method will reduce the emanation of rn-222 throughout surrounding. radon sentinel 1030 monitor was used to measure the concentration of rn-222 that emanates from the brick before and after coated with different type of coating materials. the concentration of rn-222 is decrease after being coated with coating materials. the concentration of layer applied with only plaster is in range of -0.6pci/l to -0.9pci/l. concentration of layer applied with plaster coated with jotun was in between -0.8pci/l to -1.0pci/l whereas the plaster coated with nippon was from -0.3pci/l to -0.9pci/l and the layer coated with dulux was in between -0.7pci/l to -0.8pci/l.
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