PURPOSE: Demonstrate penetration of x-rays through different materials.

DESCRIPTION: Place various materials between the source tube and the Geiger tube detector to observe relative absorption.

SUGGESTIONS: POSSIBLE DANGER OF LARGE X-RAY DOSES: Set spark coil to minimum voltage. Move Geiger tube around x-ray tube to show that x-rays come out more on the front side.

REFERENCES: (PIRA unknown.) See Demonstration Reference File for further information.

EQUIPMENT: Spark coil power supply, x-ray tube, glass shield, Geiger tube with audio amplifier and speaker on roll-around cart, absorbers (lead, aluminum, wood, tank of water, tank of air).

SETUP TIME: 10 min.

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