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Health, 26.06.2019 14:00, jbot9050

What a homeowner should do if a test reveals they have too much radon in their basement.

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Chemistry, 05.07.2019 03:30, jasondesatnick
1. an isotope of radon has a half-life of 14 days. a child goes to visit grandma in northern ontario. while playing in the basement, the child breathes in 4,800 atoms of radioactive radon. assuming that all of the radon decays in the child lungs, how many weeks will it take until there are only 75 atoms of the isotope left?
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Business, 02.08.2019 06:20, ridzrana02
Radon is a radioactive gas that seeps into homes from the soil. it is thought to be a leading cause of lung cancer. a research team investigates this theory. they gather large amounts of data on basement radon concentrations and lung cancer rates and conclude that the more radon there is, the more likely lung cancer is to occur. after the study is published, other researchers criticize it by asserting that the studied neighborhoods with higher radon concentrations also have a higher percentage of old people and a higher percentage of cigarette smokers than the low-radon neighborhoods. both advanced age and cigarette smoking increase the risk of lung cancer. this criticism, if correct, shows that the radon study suffered from
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Chemistry, 06.10.2019 05:30, hartmaaj95
Consider a house into which radon is emitted through cracks in the basement. the total volume of the house is 650 m3 (assume that the volume is well mixed throughout). the radon source emits 250 pci/s (a picocurie [pci] is a unit proportional to the amount of radon gas and indicates the amount of radioactivity of the gas). air inflow and outflow can be modeled as a flow of clean air into the house of 722 m3 /h and an equal air flow out. radon can be considered to be conservative in this problem. (a) what is the retention time of the house
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Engineering, 24.10.2019 17:43, Andrewecolt1993
A90-m3 basement in a residence is found to be contaminated with radon coming from the ground through the floor drains. the concentration of radon in the room is 1.5 bq · l−1 (becquerels per liter) under steady-state conditions. the room behaves as a cmfr, and the decay of radon is a first-order reaction with a decay rate con- stant of 2.09 × 10−6 s−1 . if the source of radon is closed off and the room is vented with radon-free air at a rate of 0.14 m3 · s−1, how long will it take to lower the radon concentration to an acceptable level of 0.15bq · l−1?
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