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Simultaneous long-term tests are conducted on a 2-story wood-frame house. The devices were place in the unfinished basement with hollow block wall foundation, the main level family room with granite-tiled fireplace and the master bedroom with attached bath on the second floor. The results yield: 8 pCi/L in the basement, 4 pCi/L on the main floor and 10 pCi/L in the master bedroom. What is most likely to be the source of the radon problem?
A home in a real estate transaction tested with a CRM for 48 hours yielded results of 1.2 pCi/L. The graphical data revealed hourly readings that declined rapidly after deployment, remained low for the majority of the remaining test time then increased dramatically within an hour or two from the retrieval time. What is the most likely cause of the unusual fluctuations?
A 72 hour radon test on a vacant home yields results of 5.3. The listing agent calls to request a re-test because house had been closed up for 3 months without ventilation or power. What is the best action?
A homeowner refuses to sign the non-interference agreement describing Closed Building Conditions. What is your best approach in this situation?
A laboratory count marks on a film of plastic made by alpha radiation on which type of device?
A photo-multiplier tube does which of the following:
A short-term measurement yielded results of 3.9 pCi/L. What is your recommendation?
After performing an initial short-term test for a concerned homeowner, in which situation would you recommend a long-term follow-up test?
An an initial short-term test interval is:
An electret ion chamber test measured 120 volts before it was deployed for an initial test and 60 volts when retrieved. Before conducting the follow up test, the tester should:
Co-located activate charcoal canisters measured 2.5 pCi/L and 4.1 pCi/L respectively. Which of the following is true? Co-located activate charcoal canisters measured 2.5 pCi/L and 4.1 pCi/L respectively. Which of the following is true?
High air velocity across an open-faced charcoal canister will likely result in:
Routine instrument performance checks for continuous radon monitors should be performed:
Solid-state silicon detectors count what type of radiation?
Test results yield 4.1 pCi/L. The seller of the home uses duct tape to secure a thick plastic over the open sump pit and asks you to re test. What is your best course of action?
The bias in radon measurement refers to:
The home you are about to test is very old and has a cellar-type basement with a low ceiling (6) and dirt floor. There is a washer and dryer and a workbench where the current homeowner works on model trains. How do you test this home?
The sensitivity of a radon measurement device refers to:
Upon arrival at the home, you notice open windows and the fireplace is in use. You close all windows and shut off the fireplace. What should do you do?
What is the best action when testing a vacant home during summer months?
When testing a home that will be undergoing renovation in the future:
When using electrets, a correction must be made for minor voltage drops attributable to what cause?
Which of the following actions would most impact the results of a 48 hour test?
Which of the following is true in a short-term radon test?
Which of the following statements is true about activated charcoal devices?
Which scenario best demonstrates adherence to the placement protocol?
You are on your way to retrieve a test that was placed 60 hours ago. Weather reports indicate that sustained winds greater than 30 MPH blew through the area during the last 12 hours of the test. What do you do?
You are performing a radon test on a vacant home. The listing agent is out of town but has given you verbal authorization over the phone to conduct the test. What is your best approach in this situation?
You tested a home in a real estate transaction that has a basement foundation, a crawlspace under a kitchen and a separate crawlspace under a bedroom. How many monitors should you use?
A measurement professional may accept a School Screening measurement as valid in determining any additional appropriate testing strategies.
An unusually stable test environment and high levels of humidity and/or Thoron can affect WL concentrations.
Grab and Sniff samples are adequate measurements for determining the need to mitigate.
In a real estate transaction, sellers are required to mitigate elevated radon levels.
Post-mitigation testing should be conducted at least 12 hours after the system has been activated and measurement devices placed in the same location as the initial test.