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)

Pressure, How does a manometer measure gas pressur?e

How does a manometer measure gas pressur?e

Determine the pressure against the inside walls of the pipe, When a liquid ...

When a liquid moves by a pipe having a varying diameter, the pressure against the inside walls of the pipe will be: a)  The same throughout b)  Lowest where the diameter is

OPTICS, How do I make a terrestrial telescope?

How do I make a terrestrial telescope?

Different semiconductor materials: germanium, (1)          Melting point...

(1)          Melting point : 936 0 C (2)          Atomic number : 32 (3)          Energy gap : 0.6ev (4)          It is a gray metallic looking mat

Get an expression for the fringe width in youngs double slit, Get an expres...

Get an expression for the fringe width in the interference pattern due to Young's double slit.

What is rarer and denser medium , A medium is known as denser if the veloci...

A medium is known as denser if the velocity of ray in that phase is fewer than the speed of the wave in other phase.     In comparison to air velocity of sound is main in water,

Thin films, 2. Surface Crystallography and Epitaxy Fe thin films are grown...

2. Surface Crystallography and Epitaxy Fe thin films are grown on a single-crystal Al (100) substrate surface. The films grow with no dislocations (if they are thin enough) which

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