Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Radionuclide is appropriate when several radioactive elements are involved.Most clinical diagnostics procedures used photons of some type usually gamma rays. Gamma rays with energies above 100 keV can penetrate many centimeters in the tissue.
Metastable Radionuclides :It is means half stable ,like 99m Tc which is one of man –made radionuclides that emits type of radiation not emitted by natural radioactive substance .A metastable radionuclide decays by emitting gamma ray only and the daughter nucleus differs from its parent only in having less energy. For example 99m Tc decays to form 99 Tc by emitting gamma ray of 140 keV .This is a very useful energy for nuclear medicine applications since it is penetrating enough to get out of the body easily and it is easy to shield with a few mm of lead. When a metastable radionuclide is used internally the absence of beta rays greatly reduces the radiation dose to the patient.
Types of disintegrations in man –made radionuclide :
1.The emission of positive beta (+β) or positron: this will lead to annihilation radiation ,It is accrue when the emitted positron annihilate with an electron ,energy equivalent to their masses (511keV each) is usually emitted this annihilation radiation is useful for mapping the distribution of positron emitters in the body.
2. Electron capture: The nucleus can capture one of its own electrons (usually K) which then complain with proton in the nucleus to form another neutron and thus reduces the charge on the nucleus for example the decay of 125I ,a characteristic (kα or kβ) x-ray is always emitted after k capture.After 125I has swallowed one of its own electron to become 125Xe the nucleus has 35 keV of energy which is some times emitted as 35 keV gamma ray ,or the nucleus transfers this energy directly to the remaining K electron which then uses the energy to escape leaving another vacancy in the K shell, This is called internal conversion or isomeric transition(IT).
Explain the types of polymorphism In terms of thermodynamics, there are two kinds of polymorphism. For a monotropic system, a plot of the free energy of the various polymorphs
what do you mean by nuclear fusion and fusion? explain briefly giving certain examples.
What is huygens principle and explain its applications?
Nuclear Reactor: During fission large amount of energy is free in the form of heat. A system, which is used to get controlled amount of heat energy from nuclear fission is know
what is plasma and explan in simple word
The end of a pipe is inserted into water. A tuning fork is held over the pipe. If the pipe resonates at lengths of 15 cm and 35 cm, what is the frequency of the tuning for
A 240-turn solenoid having a length of 21 cm and a diameter of 8.8 cm carries a current of 0.44A. Calculate the magnitude of the magnetic field inside the solenoid.
Q. Dissimilarity between an intrinsic and extrinsic semiconductor? Answer:- Semiconductors permit only a little amount of light to pass through them. They are of two n-kin
Calculate the density of sodium metal. The length of the body-centered cubic unit cell is 4.24 A.
Applications of cement mortar 1. It is used to carry out pointing and plaster works on exposed surface of masonry. 2. It is used to bind the building units like bricks, ston
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd