11.   A screen filter blocks particulates such as radioactive dust, while a charcoal matrix absorbs vapors from toxins such as a nerve agent.

12.   After the radioactive dust settles, presumably, Fascism will rise again.

13.   Contamination by radioactive dust would increase the odds of cancer over time.

14.   He arranged for gas masks, protective suits and stations where cars and people could be cleansed of radioactive dust.

15.   He worked, ate, and slept in radioactive dust because dust was all that was left.

16.   The topics of his papers then turned from purely industrial safety to concerns about radioactive dust from nuclear detonations and related subjects.

17.   They scraped paint and debris from the surfaces, stirring radioactive dust into the air.

18.   Tiny radioactive dust particles, carried by the wind and by building ventilation systems, would need to be cleaned from every surface by workers wearing protective gear.

19.   Workers must chip or blast away the first few millimeters of the surface, and they can be exposed to high levels of radiation and clouds of radioactive dust.

20.   Plant officials had first said the water filtration system was leaking, then they said the system had been contaminated by radioactive dust.