Objectives/Goals
Shields block Beta particles and Gamma rays from
reaching a point. Shields of greater density will have a greater effect on
blocking the radioactivity.
Methods/Materials
I used a Geiger counter, Beta sample, Gamma sample,
and 20 different shields. I set up the Geiger counter and read each source
through the different shields. Each shield had a different thickness, mass, and
was a different material. I conducted 5 trials on each shield, and then
averaged the data.
Results
When Beta particles and Gamma rays were read through
a shield with more mass, the reading was lower than if read through a shield of
less mass. Also, Gamma rays were much more powerful than Beta particles.
Conclusions/Discussion
My results showed that my hypothesis was correct in
that Beta particles and Gamma rays are blocked by shields. This effect varies
with the density of the shield. However the readings varied with each trial, so
the averaging of five or more times was called for. Averaging multiple trials
enabled me to see a trend and draw conclusions from the data.
Project Summary
The effectiveness of various materials in blocking
Beta particles and Gamma rays.
Cameron D. Alsbrook
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