Sodium iodide crystal (nai), Physics

Assignment Help:

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 rays

It 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.

 

12_Sodium iodide crystal (NaI).png


Related Discussions:- Sodium iodide crystal (nai)

Gel and emulsions, WHAT IS THE RELATION B/W GEL AND EMULSION? WHAT ARE THE ...

WHAT IS THE RELATION B/W GEL AND EMULSION? WHAT ARE THE CLASSIFICATIONS?AND FEATURES OF GELS AND ASLO EMULSIONS

Explain the electric forces and fields, Explain the Electric Forces and Fie...

Explain the Electric Forces and Fields This can be thought of in terms of an electric field, E, similar to the gravitational field discussed earlier [Fg = m g( r ) where at the

Where does centre of gravity and centre of mass differ?, WHERE DOES C.O.G A...

WHERE DOES C.O.G AND C.O.M DIFFER?....GENERALLY BOTH COINCIDES....GIVE EXAMPLE WHERE BOTH DIFFER? Ans) C.O.G and C.O.M mainly coincides at the see-level region.But C.O.G is a va

What is the directionality of laser, What is the Directionality of LASER? ...

What is the Directionality of LASER? Directionality: Laser emits light which is highly directional. Laser light is emitted like a relatively narrow beam in an exact direction.

Calculation of number of atoms per unit cell, Calculation of number of atom...

Calculation of number of atoms per unit cell The number of atoms per unit cell occurs on the crystal structure and the kind of basic elements (basis or pattern unit or motif) t

Resistance measurements, Resistance measurements: An example of how to ...

Resistance measurements: An example of how to make AC voltage measurements is shown in the diagram below. Once again, the red and black test leads are connected to the '+' and

Magnetic force does the wire experience, Consider a 10 cm long portion of a...

Consider a 10 cm long portion of a straight wire having a current of 10 A placed in a magnetic field of 0.1 T making an angle of 530  with the wire. What magnetic force does the wi

Calculate the velocity of the ball, A boy is standing on an elevator which ...

A boy is standing on an elevator which is traveling downward with a constant velocity of 30 meters per second.  The boy throws a ball vertically upward with a velocity of 10 meters

Phenomenon of photoelectric effect?, A radiation of 500nm is incident on a ...

A radiation of 500nm is incident on a metal surface whose work function is 3ev.why do we not observe the phenomenon of photoelectric effect? Ans) Because the energy of radiation i

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd