Principles of radiation therapy, Physics

Assignment Help:

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.


Related Discussions:- Principles of radiation therapy

Can a solid and liquid together be possible, Can a solid and liquid togethe...

Can a solid and liquid together be possible? Actually, substances can exist in all three states of matter concurrently if the conditions are right. The triple point of a substa

Question about antimatter, Hi i am doing research right now on anti-matter....

Hi i am doing research right now on anti-matter. I am just wondering if it is present in the human body?

Second law of black hole dynamics, Second law of black hole dynamics ...

Second law of black hole dynamics Along with black-hole interactions, or interactions among normal matter and black holes, the total of the surface areas of all black holes i

Define the formula of wien law, Define the formula of Wien law. WIEN'S ...

Define the formula of Wien law. WIEN'S LAW: λ m T = constant Here: λ m = Peak Wavelength (m) T = Surface Temperature (K) Constant = 2.898 x 10 -3 mK It

Determine collision, Ball A, with a mass of 0.20 kg, strikes ball B, with a...

Ball A, with a mass of 0.20 kg, strikes ball B, with a mass of 0.30 kg. The initial velocity of ball A is 0.95 m/s. Ball B is initially at rest. What are the final speed an

Explain about the transmission electron microscope, Explain about the trans...

Explain about the transmission electron microscope. The Transmission Electron Microscope Transmission electron microscopy (TEM) is a microscopy method; a beam of electrons i

What are the mean energy transferred - photon interactions, Photon Interact...

Photon Interactions a. Consider a Si detector of 1 mm thickness. 10 6 photons each with energy of 100 keV are incident on the detector. Find the number of coherent, Compton, an

Is electric potential is a function of x only, What does it signify to say ...

What does it signify to say that the electric potential is a function of x only? More exclusively what does the equipotential diagram (in 3-dimensional space) look like in the case

develop an expression for the ration, A reversible power cycle receives en...

A reversible power cycle receives energy H Q from a reservoir at temperature H T and rejects C Q to a reservoir at temperature C T. The work developed by the power cycle is used to

Define elastic limit, Elastic limit is the upper limit of deforming force u...

Elastic limit is the upper limit of deforming force up to which, if deforming force is swap, the object regains its real form totally and after that limit, if deforming force is en

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd