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Solid state simeconductor
It is main advantage is that it has much better resolution than NaI(Tl)It is main disadvantages are that it is not available in large sizes and it is much more expensive.
The principle of operation :its acts as a solid ionization chamber so it acts as an insulator and dose not allow current to flow until ionization has taken place in its volume. It kept very cold to minimize the current produced by thermal activation of electrons.
Collimator: it is used on the scintillation detector to limit its counting volume. It is a specially designed lead shield with one or more holes in
It has two types:1 – The open flat field collimator: it is useful for detecting gamma rays from a relatively large volume such as the thyroid or kidney.2- The focused collimator : it has a number of trapped holes oriented to point at a small volume 7.5 to 12.5 cm from it , it is often used in nuclear medicine
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. State the fundamental postulates of special theory of relativity? The two basic postulates of the special theory of relativity are: (i) The laws of Physics are the simila
Can you explain thermistor? Write short notes on back emf and internal resistance of a cell.
The density, ?, of an object is given by the ratio of the object's mass, m, and volume, V, according to the equation ? = m/V. What is the density of a cube that is 1.2 cm on each s
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The wheatstone bridge: You have already solved resistor networks using Ohm's law and Kirchoff's laws. In this unit we are going to look at a special arrangement of series and
Described below is a positively charged particle in a uniform rightward-directed electric field. The particle has a velocity focussed toward the top of the screen. Which of the pat
Why magnetic poles are reversed at a given position on a deflection magnetometer to take readings? The magnetic moment of the magnet is 30 A-m 2 . Its length 10cm. What is its
In plane transmission grating the width of the each slit is same to half of the opaque portion. Which order of spectra will be absent?
two forces of 20 units and 30 units act at right angle what is the magnitude of resultant force
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