Where made: 
Australia

Four glass projector slides of Radon Lab work.

1)  Probably shows lead container for radium sample and radon collection lines

2)  Autoradiograph from '10?g unit strength plate'

3)  Activity measurement using Siemens Momentan Dosimeter (ID 1766)

4)  Clinical application with radon 'seeds' embedded in wax applied to a lesion.