Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
6 Cards in this Set
- Front
- Back
|
Radioactivity
|
The spontaneous breaking up of unstable nuclei with the emission of one or more types of radiation.
|
|
|
Isotope
|
Atoms of the same element which have the same number of protons but a different number of neutrons.
|
|
|
Radioisotope
|
Radioactive form of an element
|
|
|
Alpha Particles
|
Positive charge +2. Represented by helium nuclei. Weak penetration - can be stopped by hand. Can cause cancer. Americium-241 used in smoke detectors. Half life → + 400 yrs.
minus mass number by four minus atomic number by two |
|
|
Beta Particles
|
Electrons. Negative charge -1. Greater penetrating ability.
5mm of aluminium. Carbon dating. plus atomic number by one |
|
|
Gamma Rays
|
Waves of high energy. No charge. Strong penetrating ability → thick lead. Cause cancer.
Cobalt 60 → treat cancer |
