DTD, SMD and SSD are three different systems used to reduce the radon concentrat

Question

DTD, SMD and SSD are three different systems used to reduce the radon concentration levels in an area. Radon concentration in three of the houses in this area were measured and mitigated using three different systems namely, DTD, SMD and SSD. The concentration values before and after were measured and are given below System DTD SMD SSD Pre-Mitigation (Pci/L) 4.8 6.6 11.2 Post-Mitigation (Pci/L) 0.5 2.6 3.8 The most effective system based on removal efficiency among these three is: Hint: Calculate percentage decrease for three systems. Higher the percentage decrease higher is the efficiency SSD DTD SMD None of the above

Explanation / Answer

Answer:- DTD

Solution:-

Percentage decrease in concentration of radon in DTD system = (4.8 - 0.5)/4.8 *100 = 89%

Percentage decrease of concentration of radon in SMD system = (6.6 - 2.6)/6.6 *100 = 60.6 %

Percentage decrease of concentration of radon in SSD system = (11.2 - 3.8)/(11.2) * 100 = 66.07 %

From above we can see that DTD system is most effective. Answer

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