Radioactivity

Question 1

What is radioactivity?

Answer 1

• Some isotopes have unstable nucleuses.
• To become stable the neuclues gives out radiation.
• Radioactive decay.
• Total random process.

Question 2

What is the activity?

Answer 2

• rate at which a source of unstable nuclei decay.
  Activity is measured in Bq.
• 1 Bq is 1 decay per second.

Question 3

How do we measure the activity of a radioactive source?

Answer 3

• geiger-,Muller tube.
• ## The count rate: Number of decays recorded each second by a detector.

Question 4

What are alpha particles?

Answer 4

• Consists of 2 neutrons and 2 protons.
• ## Same as the nucleus of a helium atom.

Question 5

What is a beta particle?

Answer 5

• A beta particle is an electron which is ejected from the nucleus at very high speed.
• Formed inside the nucleus when a nuetron changes into a proton and electron.

Question 6

What is a gamma ray?

Answer 6

• Type of electromagnetic radiation from the nucleus.

-

Question 7

What are the 4 types of radiation?

Answer 7

• Gama Ray.
• Beta.
• Alpha.
• Neutrons.

Question 8

What are the 4 types of radiation?

Answer 8

• Gama Ray.
• Beta.
• Alpha.
• Neutrons.