To determine what conditions change the amount of radiation received
from a radioactive source. Materials: Geiger counter, radioactive source for
both beta particles and gamma waves, aluminum, cardboard, and lead
barriers. The Geiger counter probe was positioned 10 cm above the beta
source using a ring stand and clamp. A reading was taken without any
shielding and recorded in the data table. The probe was shielded with
cylinders composed of various materials: cardboard, aluminum, and lead.
The readings were recorded. The beta source was removed and replaced
with a gamma source. The entire procedure was repeated. The data is
shown above. Next the Geiger counter probe was placed behind a frame
that was capable of holding sheets of various materials: cardboard,
aluminum, and lead. The beta source was placed on one side of the
framework and the Geiger counter probe on the other. An initial reading
was made and recorded. One sheet of cardboard was placed between the
beta source and the probe, and a reading was taken. More sheets were
added, as noted in the data table, and radiation readings were taken. The
cardboard sheets were then replaced by aluminum, and finally lead, in the
same sequence as before. Compare the data from the data tables. In
order to minimize any exposure to gamma radiation, the best method
would be to