25.3 – Detecting Radioactivity

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25.3 – Detecting Radioactivity

Radiation detectors Instruments used to identify ions formed when radiation passes through matter

Electroscopes – measure charged particles in the air Cloud chamber – detects alpha or beta particles by means of a trail of condensed vapor Bubble chamber – detects radioactive particles by means of a bubble trail in a superheated liquid

Geiger Counter Video Clip Measures radioactivity by producing an electric current when radiation is present Video Clip

Background radiation Comes from radon gas produced in Earth’s crust, from cosmic rays and from radioactive isotopes in the body

In-Class Assignment/Homework Pg. 800 #1-5 25.3 Reinforcement WKT

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