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Indoor Air quality is greatly affected by Radon, which can cause lung cancer. When we moved to Colorado, we tested the house for Radon and installed a radon mitigation system.
Consider the diagram below as a model for radioactive indoor air pollution.
Assume the soil under my single story house emits 1.5pCi/m2 of Radon. To be conservative, assume that all this Radon seeps through the floor and into the house. The floor space is 250 m2 and the ceiling height is 3m. The air exchange in the house is 0.9 air changes per hour.
Answer the following questions
a) Calculate the decay rate of radon in units of hr-1.
b) Develop a mass balance equation for the concentration of radon in the house using the diagram above.
c) Assuming steady state, what is the concentration of radon in the house in pCi/m3. Let the ambient outdoor concentration be negligible.
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The specimen was 8 cm in diameter and had a length of 85 mm. The area of the standpipe was 0.45 cm^2. Compute the coefficient of permeability of the soil in cm/s, m/s, and ft/d. What was the probable classification of the soil tested
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Determine what fair amount she should receive if she decides she want to be paid: a. In 2 equal installments - one immediately (at T=0) and one at the end of month 36.
The mass m, stiffness k, and natural frequency fn of an undamped SDF system are unknown. These properties are to be determined by harmonic excitation tests. at an excitation frequency of 4 Hz, the response tends to increase without bound.
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