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Sodium iodide crystal (NaI)
It scintillate with good efficiency when gamma ray is absorbed, these crystals where attached directly to the PTM to detect a weak flashes of light .They where improved by adding a trace amounts of thallium(Tl)and often referred as NaI(Tl) detector. It is the most widely used detector in medicine .A nuclear medicine scintillation detector system
1-Scince the NaI(Tl)detector is very sensitive ,it has to be well shielded from background radiation .2- five or more cm of lead surrounding the NaI(Tl)crystal except at the collimator .3-The electron emitted at the photocathode of PTM produce an electrical pulse at the output .4-this pulse is electronically amplified at the amplifier. 5-The pulse can be directly counted by the scalar.6-The pulse pass to the single channel pulse height analyzer(PHA) to determine the energy of the gamma raysIt contain an upper discriminator (it rejects the pulses larger than a chosen size)
lower discriminator ( reject the pulses smaller than a chosen size)
window(it is the energy difference between the upper and lower limits )
Multi Chanel analyzer (MCA): it determine the pulse height distribution of all the pulses from the detector ,so it sorts the pulses according to the size.
If electrons are treated as classical particles,which statistics will they follow?
The energy possessed by a object by virtue of its motion is known as kinetic energy (KE). The KE of a moving body is similar to the amount of work that must be given to bring a
two travelling sinusoidal waves are described by the wave function, y=55
Figure shows the magnetic circuit of a relay. When each of the air gaps are 1.5mm wide find the mmf required to produce a flux density of 0.75 T in the air gaps. Use the B-H cu
human eye and its defect,
The topic for the project is to design an Automotive Cruise Control System although you may choose a different title for your report. The aim is to research cruise control systems
Polystyrene film is extruded flat and free from pin-holes. Film is made from polystyrene granules by extruding heated tube of polymer which is then spread out and stretched state.
2 liters of water at 80 celsius is found into a plastic bucket containing 10 liters of water at 20 celsius what is the final temp of the mixture. specific capacity of water is 1 c
A FORCE OF 10I-3J+6K NEWTON ACTS ON A BODY OF 5KG AND IT DISPLACESFROM 6I+5J-3KMETRE TO 10I-2J+7K METRE. THE WORK DONE IS A)100J B)O C)121J D)NONE
The argument reveling that tachyons (must they exist, of course) cannot carry an electric charge. For a (imaginary-massed) particle travelling quicker than c, the less energy the t
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