part 1 Flashcards
define energy
the ability to do work or physically influence surroundings because fo position, chemical state or nuclear state
what is the mass-energy equivalence equation
e=mc^2
define ionizing energy
any electromagnetic or particular radiation that has sufficient energy to remove an electron from an atom
define collimation
the procedure of confining the xray beam to the area of anatomic interest to limit pt radiation dose
describe how weight is diff than mass
weight is determined by the force of gravity and can change depending on position
mass is the quantity of matter as determined by the object’s energy equivalence
how is xray interaction diff than other types of electromagnetic radiation
xrays interact at the electron level or nuclear level, ionizing an atom or ejecting a nuclear particle. lower energy ER interacts with molecules, cells, and larger objects in a way that will usually just elevate temp of the object
what does ALARA
as low as reasonable possible
define radiation
the emission and transfer of energy from one area or medium to another
what are cathode rays
a stream of electrons emitted from the filament (neg side) of an electric vacuum tube
define inertia
the property of matter that acts to resist change in an object’s state of motion
define accelereation
the rate of change of velocity with time
define convection
the transfer of thermal energy from one positron to another by moving fluid medium (liquid or gas)
define work
the force applied to an object multiplied by the distance over which it is applied
define velocity
the rate of change of of position with time
what are the 4 special quantities of radiation measurements
exposure
dose
effective dose
radioactivity
