the presence of ionizing radiation may be detected in which of the following ways?
1. ionizing effect on air
2. photographic effect on film emulsion
3. fluorescent effect on certain crystals
a. 1 only
b. 1 and 2 only
c. 1 and 3 only
d. 1,2 and 3
1. ionizing effect on air
2. photographic effect on film emulsion
3. fluorescent effect on certain crystals
a. 1 only
b. 1 and 2 only
c. 1 and 3 only
d. 1,2 and 3