Vocabulary
the average energy deposited per unit length of radiation
what is LET?
examples of particulate radiation
what are alpha & beta electrons, protons, neutrons and ions
the time scale is divided into ______ phases
what is 3?
the order of most commonly used cancer management treatments
what are surgery, RT, Chemo?
defined by the ability to produce damage
what is ionization?
Two types of background radiation
what are cosmic and terrestrial radiation?
period in which damaged atoms and molecules react with other cellular components in rapid chemical reactions
what is the chemical phase?
expressed as a summation to include the effects of irradiation of tissue by more than one radiation (unit: Sv)
what is equivalent dose?
The amount of material needed to reduce the intensity of the photon beam to half of its original intensity
what is the Half Value Layer (HVL)?
radio waves, microwaves, UV light, X-rays and gamma rays are examples of this
what is electromagnetic radiation?
consists of the interactions between charged particles and atoms in which tissue is composed
what is the physical phase?
advice on the choice of schedules for RT (i.e dose rate, conversion formula for changes in fractionation etc)
what are protocols?
describes the concept that as radiation dose is increased, there will be a tendancy for tumor response to increase
what is the concept of therapeutic index?
these particles penetrate deeper than alpha particles because they have a lower mass
what are beta particles?
includes all subsequent processes (i.e fibrosis)
what is the biological phase?
this device uses iron ions to measure X-rays, gamma rays and electron doses
what is a Fricke Dosimeter?
this assay determines how a group of cells will react to radiation by observing how a single cell of that particular type reacts to radiation
what is a clonogenic assay?
interaction in which the incident photon interacts with the outer orbital electron whose binding energy is very low in comparison with the incident photon
what is compton scattering?
give the definition/explanation of time-scale
what is the concept in which irradiation of any biological system causes several processes to occur differing greatly based on their relation to time
the tissue type that is expected to have high alpha/beta values
what are acutely responding tissues?