Yes, HEPA was in fact invented to get radioactive contaminants out of the air, or so I heard, but they are unneeded for protection from fallout because most fallout (by mass, not by particle count) consists of particles about the size of peas, which of course do not stay suspended in the air.
Of course things like N-95 masks are very useful in emergencies for other reasons.
Yes, HEPA was in fact invented to get radioactive contaminants out of the air, or so I heard, but they are unneeded for protection from fallout because most fallout (by mass, not by particle count) consists of particles about the size of peas, which of course do not stay suspended in the air.
Of course things like N-95 masks are very useful in emergencies for other reasons.