1) Write the symbols, with mass number and atomic number, for the following types of
radioactive decay particle. (a) alpha particle (b) positron (c) beta particle (d) gamma rays
2) What radiation was easiest to stop?
a) Alpha b) Beta c) Gamma d) none of these
3)What material would be needed to stop gamma rays?
a) Cardboard b) Aluminum c) Lead d) none of these
4) 241Am is used in smoke detectors as an alpha source. Write the balanced equation for
an alpha particle emission from americium
5) Smoke detectors have a very intense source of radiation, Americium-241. Smoke
detectors are considered safe and beneficial in spite of the radiation because
a) there is a shield around the Am-241 source
b) are mounted up on the ceiling
c) Am-241 is an alpha source, easily stopped by a few inches of air
d) All of the above.