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Akilesh Ramasamy writes "• X- and g -rays are called sparsely ionizing because along the tracks of the electrons set in motion, primary ionizing events are well separated in space.
• Alpha-particles and neutrons are densely ionizing because the tracks consist of dense columns of ionization.
X-rays, gamma rays, electrons, and protons are all low LET forms of radiation in that their density of ionization is sparse. In general, they penetrate tissues deeply and result in less intracellular radiation injury. High LET forms of radiation, such as heavy nuclear particles (e.g. fast neutrons), penetrate tissues less deeply and cause more radiation injury to biologic material.
LAW OF BERGONIE & TRIBONIDEAU"
Cells are most sensitive to Radiation when:
• they are actively proliferating.
• they are undifferentiated.
Exceptions to this Law:
• lymphocyte
• Oocyte
X-rays and gamma rays show latent injury that is residual tissue damage even after the initial radiation reaction is subsided. (Shafer, 1993)
Proteins tend to be more radiosensitive than carbohydrates and lipids.
Most radiosensitive tissue-small lymphocyte
Most radioresistant tissue- brain
But Alan Jackson, 2001 from Seibert, 1996.gives muscles to be the most radioresistant."
