A 90-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- (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 x 10-s. If the source of radon is closed off and the room is vented with radon-free air at a rate of 0.14 ms, how long will it take to lower the radon concentration to an acceptable level of 0.15 Bq -L-¹?
A 90-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- (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 x 10-s. If the source of radon is closed off and the room is vented with radon-free air at a rate of 0.14 ms, how long will it take to lower the radon concentration to an acceptable level of 0.15 Bq -L-¹?
Materials Science And Engineering Properties
1st Edition
ISBN:9781111988609
Author:Charles Gilmore
Publisher:Charles Gilmore
Chapter4: Temperature Effects On Atom Arrangements And Atom Motion
Section: Chapter Questions
Problem 4.14P
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![A 90-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- (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 x 10-s. If the source of radon is closed off and the room is vented with radon-free air at a rate
of 0.14 m. s, how long will it take to lower the radon concentration to an acceptable level of 0.15 BqL-¹?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F11adb83d-8871-41e5-bb97-2ea571aa0e6e%2F162c858d-14c7-44de-8a07-de04a236fc20%2Fsuuza2_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A 90-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- (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 x 10-s. If the source of radon is closed off and the room is vented with radon-free air at a rate
of 0.14 m. s, how long will it take to lower the radon concentration to an acceptable level of 0.15 BqL-¹?
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