CONCEPTS

We study three types of radiation (a, ß and gamma)
a and ß particles are emitted from the nucleus of an atom when it disintegrates.
Gamma rays are emitted when an electron changes its orbit.
Properties of the three types of radiation.
Proton number and nucleon number
Isotopes
Radioactive decay and half-life
Background radiation.
Splitting the atom and nuclear energy.
Peaceful uses of radiation.

LESSONS

Detecting radiation with a GM tube, with a spark counter and with an electroscope. (page 338-339)
Relative penetration of a, ß and gamma rays (P341)
Paths of particles in a cloud chamber.(P338)
Deviation of particles in a magnetic field (P340)