Conventional Radiography, Tomography and Their Biological Effects
Marcella Flake and Carolyn Kinder
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Lesson Plan: Can We Restrict Light
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Objective The restriction of x-radiation to only the desired body part during an x-ray may not be clear to many students.
This lesson will allow students to restrict light, thus drawing a parallel between the light that is allowed to pass to an object, with the radiation that is allowed to pass from an x-ray machine to a designated body part.
Materials Needed Large flashlight or floodlight, black construction paper, scissors, tape, large doll, ruler.
Procedure
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1. Have students cut six strips from the construction paper. Two strips should be 3” wide, two at 2” and two at 1” width.
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2. Have students shine the flashlight on the chest area of the doll.
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3. Have students then tape the 1” strips on the face of the flashlight near the edges to block the light. Repeat step 2.
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4. Have students replace the 1” with 2” strips and repeat step 2.
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5. Have students replace the 2” with 3” strips and repeat step 2.
Observations and Analysis
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1. As the strips are applied to the flashlight, the students will see that light can be blocked.
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2. The wider the strip, the narrower the amount of light that is allowed to shine on the chest of the doll.
This is similar to how x-radiation is restricted in taking radiographs.
