- Created by: parrot16
- Created on: 07-04-15 16:19
What do radioactive substances emit?
Alpha, beta and gamma radiation
What does nuclear radiation cause?
Ionisation of of atoms
Why can't we predict when a nucleus will decay?
Its random process
Why will the average count rate on the geiger muller counter be the same?
There are so many nuclei in a radioactive isotope
What are radioactive nuclei like?
Large and unstable and cant be held strongly enough in the nucleus.
What causes a nucleus to become unstable?
Adding or taking away too many neutrons
What is the half life?
The time it takes half of a radioactive nucleus to decay and it cant be changed
What is a nucleon?
Protons and neutrons
What happens to radioactivity of a substance overtime?
It decreases because overtime more and more of the nucleus decays
What happens to the radioactive nucleus when it has decayed?
It changes to another element
What are alpha particles made of?
Helium nuclei with helium gas around it and consists of 2 protons and 2 neutrons adn has a very large mass and best ionisers
What is a beta particle?
A high speed electron with a very small mass
What charge is an alpha particle?
What charge is a beta particle?
Similarities between x rays and gamma ray
Both electromagnetic waves, high frequency, both ionising, both used in medical treatment, both very penetrating, both similar wavelengths.
How are gamma rays produced?
Randon nuclear decay
What is gamma
An electromagnetic wave
What happens during alpha decay?
Mass number decreases by 4 and nucleus has 2 fewer neutrons and 2 fewer protons. Atomic number decreases by 2.A new element…