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  1. Isotopes: Elements with same Atomic number (Number of protons same, Number of Neutrons Vary) 
  2. Most used materials for external irradiation- Cobalt 60 , Cesium 131 ( Gamma rays) 
  3. Machine used for electron therapy- Betatron , Material used is Tungsten 
  4. Substances used as permanent implant for radiation- 
    • Gold Grains 
    • Radon Seeds 
  5. For permanent insertion into cavities 
    • Colloidal Gold 
    • Vitrium 
    • Phosphorus 52
  6. Radio active phosphorus is useful in
Diagnosis of
  • Eye Cancers 
  • Oesophageal Cancer
Treatment of – 
  • Polycythemia Vera 
  • Multiple Myeloma 
  • Secondaries in Bone 
  • Ca Prostate after priming with androgen. 
  • Malignant ascites 
Effect of Radiation on Tissues
Most Commonly affectedSkin
Most Senstive MucosaIntestinal Mucosa
Most Sensitive CNS partMid Brain, Medulla, Spinal Cord
Most sensitive cell in CNSNeurone
Most Sensitive blood cellsLymphocytes
Most resistant Blood cellsPlatelets
Most sensitive organ in abdomenKidney

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