charcoal canister การใช้

• Some of the testing devices, like the charcoal canisters, are designed for short-term testing only.
• The most common radon test used today, Pappas said, is known as the charcoal canister test.
• I can see myself after retrieving the car from servicing, anxious about whether the charcoal canister was actually examined for clogging.
• Charcoal canisters, alpha-track detectors and charcoal liquid scintillation devices are passive instruments that are available by mail or at large home centers.
• Nancy Bredhoff, president of the Radon Testing Corp . of America, a nationwide testing lab in Elmsford, N . Y ., said homeowners could also do their own preliminary screening for radon by buying a charcoal canister and later mailing it to a lab for testing.
• In testimony two weeks ago to a U . S . Senate committee, Dr . Richard G . Sextro, chairman of a subcommittee on radon research for the Environmental Protection Agency, said short-term tests-- usually using charcoal canisters placed for two days in basements or living areas-- had been found to give false positive readings more than half the time.