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)

How greatly does automotive oil weigh, Q. How greatly does automotive oil w...

Q. How greatly does automotive oil weigh? Answer:- As a rough guide engine oil typically weighs about 0.87 kg/litter or about 7.2 pounds per US gallon. Regrettably a rough

A foucault pendulum to show the rotation of the earth, A  Foucault pendulum...

A  Foucault pendulum to show the rotation of the earth A G-clamp with a ball bearing soldered to the inside of the jaw makes a excellent support for a Foucault Pendulum. It is

Charges, determine the neutral point in a system of two unlike charges sepe...

determine the neutral point in a system of two unlike charges seperated by a distance

Determine the vertical support reactions, The I beam weighs 0.6kN/m and sup...

The I beam weighs 0.6kN/m and supports the load which is P33 kN as shown. The distance from the load to point B is P34 m.  Determine the vertical support reactions at A and B.  (A

How to identify a hard-boiled egg, How to identify a hard-boiled egg Se...

How to identify a hard-boiled egg Secure a fresh egg and a hard-boiled egg. Give every of them a spinning motion in a soup dish or a plate. View that the hard-boiled one spins

English, distinguish feature of litearay writing

distinguish feature of litearay writing

Electric field, Can we take a negative test charge to find electric field?

Can we take a negative test charge to find electric field?

Digestion sytem, what is the substance produced in the liver that acts in t...

what is the substance produced in the liver that acts in the small intestine during digestion?

What wavelength is formed by this pipe, An organ pipe which is open at both...

An organ pipe which is open at both ends resonates at its fundamental frequency.  Neglecting any end effects, what wavelength is formed by this pipe in this mode of vibration i

Describe motion in two dimensions, Motion of an object in a plane is called...

Motion of an object in a plane is called two dimensional (2-D) motions. For 2-D motion acceleration or velocity can be explained by two elements in any two mutually perpendicular d

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