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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.
A single-phase transformer has 2400 turns on the primary and 600 turns on the secondary. Its no-load current is 4A at a power factor of 0.25 lagging. Suppose the volt drop
The Trigger In particle physics, a trigger is a system which uses easy criteria to rapidly decide that events within a particle detector to remain while only a small fraction o
Sol: The incident angle is 45 because the angle of reflection and angle of incident is equal.
If either screen or source or both are at preset distance from the diffracting device (obstacle or aperture), the diffraction is known as Fresnel type.
Aluminium is (A) Silvery white in colour. (B) Yellow in colour. (C) Reddish in colour. (D) Pale yellow in colour. Ans: Aluminium is Silvery white in c
A closed magnetic circuit of cast steel have a 6cm long path of cross-sectional area 1 cm 2 and a 2 cm path of cross-sectional area 0.5cm 2 . A coil of 200 turns is wound arou
Explain the absorption and emission transitions of A and B coefficients of Einstein. Assume that N 1 and N 2 be the number of atoms per unit volume along with energy E 1 and
Start from the expression of the electric field outside an infinite sheet of uniform surface charge density, E = s/2epsilon, derive the electric field just outside an ideal conduct
explain air wedge
The resistances of commercially-available discrete resistors are restricted to particular sets. For example, the available values of resistors with 10% tolerance are selections fro
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