This paper reports how three field sampling methods performed in different rooms and on different surface types and how they compare using two different metrics of concentration (μg/g) and loading (μg ...

Air and surface sampling techniques currently used by the US government are effective in fighting bioterrorism and potentially saving lives, a former Department of Homeland Security medical officer ...

The first video in Pew Research Center’s Methods 101 series helps explain random sampling – a concept that lies at the heart of all probability-based survey research – and why it’s important. Fresh ...