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!
Short- distance radiotherapy or brachytherapy:
The advantage: it gives a very large dose to the tumor with a minimum radiation to the surrounding normal tissue.Disadvantage : The no uniformity of the dose and the radiation safety.
- The radiation source is radium but it replaced by 222Rn (radon gas) which is obtained by placing radium in a solution. Radon also by radioactive gold 198Au .There is also 125I which is used for permanent implants.
-Brachytherapy is also use beta particles ,fast electrons emitted certain radionucleus.
- The (Yttrium 90) 90Y is the most common source of beta particles ,it is continuously being formed by the decay of strontium 90Sr which emits beta ray with energy of 0.54 Mev and 90Y emits β-ray with energy of up to 2.22Mev ,these rays can penetrate about 4mm and almost ideal for treating lesions on the eye.
Electrons in radiotherapy :
- Electrons ,unlike gamma rays and x-rays ,have a fixed range.- The radiation at low electron energies is relatively uniform over most of its travel and this advantage is gradually lost in going to higher electron energies .- Disadvantage : there is some skin sparing since the maximum dose occur below the surface but its amount is small compared to that from high energy x-ray beams. π-(Pi minus) mesons in radiotherapy:- Disadvantage: there life time is 10-8sec, high cost ,and protection problems.- Advantage: eliminate some or all of the oxygen effect
ML -3
A single movable pulley Suspend two pulleys on a cord from a horizontal support, and load them as shown. If there is no adjustable support on the expression desk, a window stic
Special Theory of Relativity deals with the relativity of motion and of rest is called theory of relativity. In broad sense it divides into two parts (1) GTR (General Theory o
Example of state function
SPEED: The distance covered by a body in unit time is known as speed. It is represented by V.
How will you determine the difference in the wavelengths of 2D lines of sodium light buy Michelson Interferometer
Match the name of the phenomenon with the explanation of the phenomenon. Answer: There isn't such thing as orthomagnetism. The prefixes can assist you out with the answ
A satellite is goes form the surface of earth vertically and then is turned horixontally in space as it requires to revolve around the earth.
explain refractive index of the transparent liquid using prism and spectrometer?
what is capillary laws
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd