Question 1
Radiation can be detected as it interacts with matter by the use of:
I) photographic film
II) a bubble chamber
III) Geiger-M
ller counter
◦ I, II, III
◦ I and II
◦ I and III
◦ II and III
◦ III only
Question 2
Strontium-90 is a byproduct in nuclear reactors fuelled by the radioisotope uranium-235. The
of
is 28.8 y. What percentage of a strontium-90 sample remains after 75.0 y?
◦ 68.1
◦ 16.4
◦ 7.40
◦ 38.4
◦ 2.60