Radon monitor used by NRPB for survey
radon monitor c. 1990 used by NRPB for a survey of radon in homes.
Radon monitor c. 1990 used by NRPB with additional monitor and a sheet of plastic with tracks made by alpha particles
Radon monitors made and used by the National Radiological Protection Board, c. 1990. A small sheet of clear plastic inside the monitor has tracks made by alpha particles.
radon monitor c. 1990 used by NRPB for a survey of radon in homes.
radon monitor as used c. 1990 by NRPB for a survey of radon in homes. containing a sheet of plastic with tracks made by alpha particles
sheet of plastic with tracks made by alpha particles as used in a radon monitor c. 1990 used by NRPB for a survey of radon in homes