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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.
Determine about the Stacking fault Stacking faults happen in a number of crystal structures, but the common example is in close-packed structures. Face-cantered cubic (f
calculating work
determine the pressure of a 20 lb force applied to an area of 10 inch squared
The relative permeability of a paramagnetic substance is (A) Unity. (B) Slightly more than unity. (C) Zero. (D) less than unity. Ans: The relativ
How is polymer fibers terminated? PMMA fiber single ends can be of some types always depending upon the nature of the conductor and the last application. A Simply cut fiber wit
A body moves along x-axis with velocity v at position x. If the plot v-x is an ellipse with major axis 2A and minor axis 2u, what is the modulus of maximum acceleration?
What do you mean by normal shift? Derive the mathematical expression for normal shift produced when an object in a denser medium is viewed normally through air.
Polarization: The dipole moment per unit volume of the solid is the sum of all the individual dipole moments within that volume and is called as 'Polarization' P of the solid.
For each element the number of neutrons in the nucleus can vary. Isotopes :Nuclei of given element with different numbers of neutrons.If they are not radioactive they called
What is the fractional change in the resistance of an iron filament when its temperature changes from 25.0°C to 50.0°C?
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