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
Half life of IODINE-131
8 days
Half life of URANIUM-238
4.5-10 years
UNITS OF MEASUREMENT OF RADIATION
- Curie (C)
- Millicurie (mc)
- Microcurie (c)
- Roentgen (R)
- Relative Biological Effectiveness (RBE)
- Radiation Absorbed Dose (RAD)
- Roentgen Equivalent Man (REM)
- Exposure Rate Constant
- Pharmaceuticals dosage forms may be described in terms of RAD units.
BIOLOGICAL EFFECTS OF RADIATION depends upon a number of factors related to the ability of the radiation to ________, the ________ of the radiation, the particular________ and ____ exposed, and the ____ of the radiation.
BIOLOGICAL EFFECTS OF RADIATION depends upon a number of factors related to the ability of the radiation to penetrate tissue, the energy of the radiation, the particular tissue and surface area exposed, and the dose rate of the radiation.
There are a number of preparations containing radioisotopes which are used internally for therapeutic and diagnostic purposes. These preparations are referred to, collectively, as?
radiopharmaceuticals
PERNICIOUS ANEMIA
CYANOCOBALAMIN 57
BLOOD VOLUME DETERMINATION
I-125 SERUM ALBUMIN INJECTION
BV AND CARDIAC OUTPUT DETERMINATION
I-131 SERUM ALBUMIN
RENAL FUNCTION
IODOHIPPURATE I-131 INJECTION
THYROID FUNCTION
SODIUM IODIDED I-131
BRAIN AND THYROID SCANNING
SODIUM PERTECHNITATE Tc99m
BRAIN AND KIDNEY SCANNING
CHLORMERODIN Hg-197
TX. OF OCULAR TUMOR AND ANTIPOLYCYTHEMIA
SODIUM PHOSPHATE P-43
Lung scanning
Tc-99m Albumin Aggregated Injection
Imaging areas of functioning reticulonucleoendothelial cells
Tc-99m Sulfur Colloid Injection
Cardiac pool pumping
Tc-99m Labeled RBC
Bone imaging
Tc-99m Methylene diphosphate
Cardiac infarct imaging
Tc-99m Pyrophosphate
Imaging of myocardial perfusion, breast tumor
Tc-99m Sestamibi
Gastric emptying imaging
Tc-99m Sulfur colloid cooked in scrambled eggs
Deep vein thrombosis
99mTc Bicirumab
Liver imaging and potency studies
Tc-99m Phytate
Cardiac infarc imaging
Tc-99m Pyrophosphate
Kidney imaging to determine renal function
Tc-99m Heptagluconate
Hepatobiliary studies
Tc-99m IDA
Bone imaging
Tc-99m Etindronate
Liver scanning
Gold Au 98
Liver function
Sodium Rose Bengal I-131
Pancreatic
Selenomethionine Se-75
IDA stands for
iminodiacetic acid
Chemical compounds containing elements of high atomic number which stop the passage of x-rays.
RADIOPAQUE CONTRAST MEDIA
Most commonly used elements in radiopaque contrast media
Ba and I
Lack of healthy RBC cause by Vit. B12 Deficiency
Pernicious anemia
type of megaloblastic anemia
Increased blood cell levels caused by the overproduction of bone marrow
Polycythemia vera
Increased blood cell levels caused by the overproduction of bone marrow
Polycythemia vera