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Radiation




        Susan Goodman
Alpha, Beta, Gamma.
                    Alpha           Beta             Gamma

Structure           2 protons       An electron      A very short wavelength
                    2 neutrons                       electromagnetic wave

Symbol              α               β                ϒ

Range (in air)      Only a few cm   A few metres     Infinite

Ionising ability    Very strong     Strong           Weak

Stopped by . . .    Paper, Skin     Aluminum, Bone   Lead, Concrete

Charge              +2              -1               None

Mass                6.6 x10-27      9.1 x10-31       None
Radiation in Medicine
 Molybdenum-99 is produced in a nuclear reactor
  and decays into Technetium-99. This has a short
half life of only six hours and only emits gamma rays
 of unvarying energy. This is therefore ideal for use
                      in medication.
The Technetium radioisotope is dissolved in a liquid.
       This is then given to the patient where its
movements can be detected, allowing us to identify
blood leakages, blockages and discover the amount
  of liquid in an organ and the total number of red
                 blood cells in a patient.
Advantages
  As the radiation used in medicine are purely
gamma emitters, they interact with the body far
   less than beta or alpha radiation and pass
    straight through it. They are also not very
   ionising, so minimal damage occurs to the
 surrounding tissues. As it has a relatively short
half life, it only has to be left for a short time for
     enough gamma rays to be emitted to be
   detected and the amount of radiation will
    become unsubstantial in only a few days.

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Tc99 by susan

  • 1. Radiation Susan Goodman
  • 2. Alpha, Beta, Gamma. Alpha Beta Gamma Structure 2 protons An electron A very short wavelength 2 neutrons electromagnetic wave Symbol α β ϒ Range (in air) Only a few cm A few metres Infinite Ionising ability Very strong Strong Weak Stopped by . . . Paper, Skin Aluminum, Bone Lead, Concrete Charge +2 -1 None Mass 6.6 x10-27 9.1 x10-31 None
  • 3. Radiation in Medicine Molybdenum-99 is produced in a nuclear reactor and decays into Technetium-99. This has a short half life of only six hours and only emits gamma rays of unvarying energy. This is therefore ideal for use in medication. The Technetium radioisotope is dissolved in a liquid. This is then given to the patient where its movements can be detected, allowing us to identify blood leakages, blockages and discover the amount of liquid in an organ and the total number of red blood cells in a patient.
  • 4. Advantages As the radiation used in medicine are purely gamma emitters, they interact with the body far less than beta or alpha radiation and pass straight through it. They are also not very ionising, so minimal damage occurs to the surrounding tissues. As it has a relatively short half life, it only has to be left for a short time for enough gamma rays to be emitted to be detected and the amount of radiation will become unsubstantial in only a few days.