Radiopharmaceuticals and Contrast Media Flashcards
_________ of an element have the same atomic number but different mass numbers.
Isotopes
number of proton in the nucleus is equal to the __________ of atom
atomic number
The only variation in isotopes
kinetic or rates of chemical reactions.
FORMULA
Protons
Protons = Electrons = Atomic number
FORMULA
Neutrons
Neutrons = Mass number – Atomic number
FORMULA
Mass no.
Protons + Neutrons
FORMULA
Electrons
Protons - Charge
Maintain their elemental integrity and do not decompose to other isotopic or elemental forms
TYPE OF ISOTOPE
Stable isotopes
Decompose or decay by emission of nuclear particles into other isotopes of the same or different elements
TYPE OF ISOTOPE
Unstable or radioactive isotopes
Commonly analysed stable isotopes include?
oxygen, carbon, nitrogen, hydrogen and sulfur.
O, C, N, H, S or CHONS
- The heaviest and slowest of all radioactive emissions
- Useless for biological applications
Alpha particles
- An electron of nuclear origin
- Lighter than alpha particles and have more penetrating power than alpha particles
Beta particles
2 Types of Beta Particles
Negatrons, Positrons
- An elementary particle with negative charge.
- Synonyms: electron.
- Useful biological applications
Negatrons
- Subatomic particle with the same mass as an electron and a numerically equal but positive charge
Positrons
- Little importance in biological applications
- They are very short lived.
Positrons
in physics,it is a reactionin which a particle (electron) and its antiparticle (positron) collide and disappear, releasing energy
Annihilation
made up your radio waves such as infrared and ultraviolet rays
photons
best described as a photon of electromagnetic radiation.
GAMMA RADIATION
- The rays are of short wavelength similar to x- rays, and travel at the speed of light.
- They have no mass and no charge but they are of very high energy, giving them excellent penetrating power.
GAMMA RADIATION
defined in which the amount of radio nuclides decays to half of its initial value.
Half-life
Half life of POLONIUM-212
Half-life 3-10 seconds