A nuclear MEMS device would collect particles produced by radioactive decay.
At the Pentagon, officials said the military on Tuesday sent a specially designed surveillance plane into international airspace around North Korea to collect particles from the test.
In the mid-1980's, Dr. Tsou ventured to the Los Alamos National Laboratory in search of a material that would allow him to collect particles moving at three to six miles per second without destroying either the particles or their collector.
In its test, the company said, water and chemical reagents are mixed in a bottle and left in a room for half an hour to collect particles from the air.
The powder was fractionated with mesh to collect particles at sizes less than 77 μm in diameter.
The product was thoroughly washed, oven dried and sieved to collect particles below 250 MIC and labelled as N1.
Micrographs of PM embedded in a sample of Whatman paper and the carbon stub used to collect particles in the same location.
An electrostatic precipitator (ESP) was used as back-up filter to also collect particles <1 μm directly onto the TXRF sample carriers.
A backup 37 mm Teflon membrane filter is used downstream to collect particles smaller than the cutoff diameter of the final impaction stage.
Due to very large size distribution, specific experimental set-up has been developed in order to collect particles at a given spraying distance.
