Page 129 - Radiation Safety

FACTORS THAT MODIFY RADIATION EFFECTS

5. Radiological Sensitivities of Cells

• Different types of cells have different levels of

sensitivities towards radiation

• Generally, radiological sensitivity of cell is directly

proportional to its divisional activities and inversely

proportional to its differentiation.

• Spermatogonium and erythroblast are actively dividing

cells - most radiosensitive cells

• Muscle and nerve cells are highly differentiate and are

not actively dividing - the most resistant to radiation

effects.

• Lymphocyte is an example of an exception. It is highly

sensitive to radiation even though it is highly

differentiate and do not divide.