In what time frame does a short term measurement device usually operate?

A short-term measurement device typically operates over a duration of 2 to 14 days. This time frame allows for a quick assessment of radon levels in a specific environment, providing data that can help in determining whether further action is needed to mitigate radon exposure.

Short-term measurements are particularly useful for homeowners or professionals who need immediate information on radon levels, as longer-term assessments can take significantly longer to yield results. Utilizing a device for 2 to 14 days strikes a balance between giving a reasonable estimate of radon concentration while still being concise enough for urgent evaluations.

The other time frames mentioned in the other options do not align with the accepted duration for short-term radon measurement devices. The range of less than 48 hours is generally too short to provide accurate readings, while 2 to 90 days and 1 to 30 days extend beyond the standard parameters defined for short-term testing.