Which device is appropriate for passive sampling, requiring no pump?

Which device is appropriate for passive sampling, requiring no pump?

• A. Passive Dosimeters
• B. Filter Cassettes
• C. Adsorption Tubes
• D. Colorimetric Tubes

Answer: (A)

Passive sampling relies on diffusion to collect contaminants over time without moving air actively through a device. A passive dosimeter is designed for this purpose: it sits in the work environment and gradually accumulates the target substance, then is analyzed later, with no pump or power needed. The other devices typically require a pump to pull air through them—filter cassettes capture particulates when air is drawn through; adsorption tubes trap vapors only as air is actively drawn through sorbent; colorimetric tubes rely on pulling a known air volume through the tube to produce a measurable color change. So, the best choice for passive sampling with no pump is the passive dosimeter.

Passive sampling relies on diffusion to collect contaminants over time without moving air actively through a device. A passive dosimeter is designed for this purpose: it sits in the work environment and gradually accumulates the target substance, then is analyzed later, with no pump or power needed. The other devices typically require a pump to pull air through them—filter cassettes capture particulates when air is drawn through; adsorption tubes trap vapors only as air is actively drawn through sorbent; colorimetric tubes rely on pulling a known air volume through the tube to produce a measurable color change. So, the best choice for passive sampling with no pump is the passive dosimeter.