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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.
Calculate the heat required to melt 316.7kg of potassium metal at 336 K. The enthalpy of fusion of potassium is 2.35 kJ mol -1 .
OHM's Law: The current passing by a conductor is directly proportional to the potential difference applied across it's end given, the temperature and other physical conditions
An atom of argon(18 protons, 19 neutrons) is ionised by the removal of two orbiting electrons. Q) How many protons and neutrons are there in this ion?
UV radiations and X - rays are: UV radiations are produced by the high energy transitions of the electrons in atoms. UV radiations have wavelengths ranging from 0.4 m m to 1n
A particle with mass m = 2:5 is moving along a straight trajectory. The distance covered by a particle is described by the function S(t) = t 3 + 2t 2 , where t > 0 is the time
i have to make a written project on this topic please tell me something what should i make
An electric iron draws a current of 0.5A.The voltage is 200V. Calculate the amount of charge flowing through it in 1 hour.
Q. Give three applications of photoelectric cells. (i) Photoelectric cells are utilized for reproducing sound in cinematography. (ii) They are utilized for controlling the
Q. Illustrate about Optical Memories? In 1983 one of the most successful consumer products of all times was introduced which is compact disk (CD) digital audio system. This CD
The Szilard-Chalmers Reaction
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