Cells are most radiosensitive at or close to mitosis, which is in the M and G2 phases.

Cells are most resistant in the late S phase.

The most radiosensitive cells is

Muscle cells is ___________ cells.

Radiation interaction with cells occurs by three phase;

Higher LET radiation may cause more damage internally but less likely to cause external hazard.

When interact with matter, gamma rays will produce dense ionization.

Cell irradiated in oxygenated @ aerobic state, biologic tissue is more resistant to radiation.

Cells irradiated in anoxic @ hypoxic are much more _____________ to radiation.

The relative capabilities of radiation with different LET to produce a particular biologic reaction is referred to Relative Biologic Effectiveness.

The similar doses of radiation of various LETs do not produce the same biologic effect.

Low LET radiation commonly cause effect to DNA molecules through direct action injury.

The high LET radiation may cause damage through __________ action.

Direct action is radiation interaction with the DNA molecules.

In indirect action of radiation, the effect of radiation on the DNA molecules are produced through the water molecules (H2O).

Free radical can migrate to DNA molecule and rupturing some chemical bonds.

X-ray photon may interact with water molecules in human body through a process called synthesis of water .

The final product of radiolysis of water are