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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 the change in entropy when 2 kg of a gas at 277 K is heated in a closed, rigid container to a temperature of 368 K. Take the specific heat at constant volume to be 1.42 K
Primary cell Is that cell in which electrical energy is produced because of chemical energy. In the primary cell, chemical reaction is irreversible. This cell cannot be recharged.
Difference among sound and light waves: (i) For propagation of sound rays material phase is required but no material medium is needed for light waves. (ii)Sound rays are long
The average energy needed to release a nucleon from the nucleus is known as binding energy per nucleon. Binding energy per nucleon diffrence Stability of nucleus
Radar: The term radar is used for radio detection and ranging. Radar having of three types of devices, a transmitter, a receiver and indicator devices. It has very high frequen
what is the working principle of diamond dosimeter and whast are its advantages and disadvantages over other dosimeters?
Point out the direction of the current if any induced to flow in the coil by the changing magnetic field. (Depicted is a view of the coil from the side. Toward the top of the displ
A mixture of methanol and water is to be separated in a new separation unit and you are required to provide a report detailing the design and costing of a distillation column with
define varigonon law
Different theories of nature of Light: What are the different theories which explain the nature of Light? A. The different theories that explains the nature of the light ar
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