Chapter 1 Concepts Flashcards
Who discovered X-rays and When?
Wihelm Conrad Roentgen on November 8, 1895
Fundaments quantity measurements expressed in the British System
Mass: Pound
Length: Foot
Time: Second
Fundamental quantity measurements expressed in the SI system.
Mass: Kilogram
Length: Meter
Time: Second
What is mass?
the quantity of mater contained in an object. It does not change with gravitational force or when a substance changes form.
Velocity (v)
Measures speed. m/s
d= distance t= time
v=d/t
Acceleration (a)
Change in velocity m/s^2
Vf= final velocity Vo= Initial velocity t= time
a=Vf-Vo/t
Force (F)
A push, pull, or other action that changes the motion of an object. newtons (N)
m=mass a= acceleration
F=m(a)
Momentum (p)
kg-m/s
m=mass v=velocity
p=m(v)
Work (work)
Joule (J)
F=force d= distance
work=F(d)
Power (P)
Watts (W)
t=time
P=work/t
Newton’s First Law of Motion
an object at rest will stay at rest unless acted on by an external force. and vise versa
Define Energy
The ability to do work
Kinetic Energy
Energy being expended. The act of doing work
Potential Energy
The ability to do work based upon an objects state or position
Roentgen
Coulomb/kilogram
Quantifies radiation intensity
Radiation Absorbed Dose (rad)
gray
Quantifies the biologic effects of radiation on humans and animals
Radiation Equivalent Man (rem)
Sievert
Quantifies occupational exposure or dose equivalent
Curie
Becquerel
quantifies radioactivity.
X-ray properties defined by roentgen
Card 1/2
1)Highly penetrating, invisible rays that are a form of electromagnetic radiation. 2) Electrically neutral and therefore are not affected by either electric or magnetic fields 3) Can be produced over a wide variety of energies and wavelengths 4. Release very small amounts of heat upon passing through matter.
X-Ray properties defined by Roentgen Cont.
Card 2/2
- travels in straight lines 2. travels at the speed of light 3. can ionize matter 4. produces chemical and biological changes in matter through ionization and excitation 5. causes fluorescence in certain crystals 6. cannot be focused by a lens 7. affects photographic film 8. produces secondary scatter radiation.
