Chapter 9 Nuclear Radiation

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Presentation transcript:

Chapter 9 Nuclear Radiation 9.1 Natural Radioactivity

Stable and Radioactive Isotopes A radioactive isotope has an unstable nucleus emits radiation to become more stable, changing the composition of the nucleus is identified by the mass number of the isotope

Nuclear Radiation Nuclear radiation is the radiation emitted by an unstable atom and takes the form of alpha particles, neutrons, beta particles, positrons, or gamma rays.

Types of Radiation Alpha () particle is two protons and two neutrons. Beta () particle is a high-energy electron. Positron (+) is a positive electron. Gamma rays are the high-energy radiation released from a nucleus when it decays.

Learning Check Give the name and symbol for the following types of radiation. A. alpha radiation B. radiation with a mass number of 0 and atomic number of +1 C. radiation that represents high-energy radiation released from the nucleus

Solution Give the name and symbol for the following types of radiation. A. alpha radiation B. radiation with a mass number of 0 and atomic number of +1 C. radiation that represents high-energy radiation released from the nucleus

Radiation Protection Radiation protection requires paper and clothing for alpha particles a lab coat or gloves for beta particles a lead shield or a thick concrete wall for gamma rays limiting the amount of time spent near a radioactive source increasing distance from the source

Shielding for Radiation Protection

Learning Check What type of radiation will be blocked by A. lead shield B. paper, clothing

Solution What type of radiation will be blocked by A. lead shield gamma radiation B. paper, clothing alpha radiation