Radiotherapy

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
 
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Most Commonly affected	Skin
Most Senstive Mucosa	Intestinal Mucosa
Most Sensitive CNS part	Mid Brain, Medulla, Spinal Cord
Most sensitive cell in CNS	Neurone
Most Sensitive blood cells	Lymphocytes
Most resistant Blood cells	Platelets
Most sensitive organ in abdomen	Kidney