Principles of radiation therapy, Physics

Principles of radiation therapy:


The basic principle of radiation therapy is to maximize damage to the tumor while minimizing damage to the normal tissue.Factors that determine how much radiation required are:


1.    The type of radiation
2.    The environment of the cell (for example its blood and oxygen supplies 
3.    The type of cell.
4.    The nucleus of the cell is more sensitive of radiation.

Some types  of radiation are more effective in killing cells or  have a higher relative biological effects(RBE)


RBE: The ratio of the number of grays of 250kVp  x- rays needed to produce a given biological effect to the number of grays of the test radiation needed to the same effect .

Lethal dose for 50%(LD50 ): the quantity of radiation that will kill half of the organisms in a population (cells ,mice, people ect)
 LD30: Theamount of radiation that will kill 50% of the organisms in 30 days ,its value for humans about 4.5 Gy.

Posted Date: 10/1/2012 7:43:54 AM | Location : United States







Related Discussions:- Principles of radiation therapy, Assignment Help, Ask Question on Principles of radiation therapy, Get Answer, Expert's Help, Principles of radiation therapy Discussions

Write discussion on Principles of radiation therapy
Your posts are moderated
Related Questions
Dual Nature of Light: As light is accepted as a form of waves as well as packets of photon. This nature of light is known as dual nature of light.

What is the difference between an artificial satellite and a natural satellite? Ans) 1:artificial satellites are man made while natural satellite are formed by nature. 2:artificia

What is meant by tunnelling phenomenon? A tunnel diode is a high conductivity two-terminal P-N junction doped heavily about 1,000 times higher than a conventional junction diod

a projectile is fired from a gun has an initial velocity of 90.0 Km/h at an angle of 60.0 degrees to the horizontal. When the projectile is at top of its trajectory an internal exp

Presbyopia: The accommodation power of a person is lost by which the suffers a long sightedness. It is known as Presbyopia or lack of accommodation.

Q. Explain the steps to the scientific notation? Answer:- To write in scientific notation you must first move the decimal point of the number to where the number is betwee

It describes that the total energy (pressure energy, potential energy and kinetic energy) of an incompressible and non-viscous fluid in steady flow by a pipe remains constant throu


The density of gasoline at 0 degrees C is 0.68 x103 kg/m3 What is the density on a hot day when the temperature is41 degrees C? What is the percentage change (+/-)?

It is the electric dipole moment induced in a system, such as an atom or molecule, by an electric field of unit strength.