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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.
Q. Define: grating element. The combined width of a slit as well as a ruling in a plane diffraction grating is called as a grating element.
Total height of the gymnast just before falling back down is=(2+.3)=2.3m Energy gained at that point = m*g*h(m=mass, g=gravitational force, h=height) =55*9.8*2.3=1239.7 J
When two objects collide like there velocities are not in the line of action of contact force then the collision is known as oblique collision. We can split also oblique collisi
why the reflective index of cladding is lower then in core of a fiber optic?
What is half wave plate? Explain its action on polarized light incident on it with its electric vector E making an angle with the optic axis of the half wave plate.
lux; lx: The derived SI unit of illuminance equivalent to the illuminance generated by a luminous flux of 1 lm distributed consistently over an area of 1 m 2 ; therefore it ha
Regard as three resistors having three unique values of resistance. Presume the resistors are connected in series with each other. Additional suppose that the series combination of
average or mean value of AC
The molar heat capacity of a gas at constant pressure is 18.7 J mol -1 K -1 . What is the heat capacity of 9.4 moles of this gas at constant volume ?
When the two simple harmonic motions have the same periodic time but different amplitude and a phase dissimilarity = ∏/2: The resultant curve may be attained graphically as abov
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