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LIFE01200604005 Shri Somnath Ghosh - Homi Bhabha National ...

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CHAPTER 1<br />

INTRODUCTION<br />

This thesis deals with radiation induced signaling in mammalian cells. This introductory<br />

chapter therefore provides an outline of our current knowledge in the same area.<br />

1.1 Ionizing Radiation:<br />

Whenever the energy of a particle or photon exceeds the ionizing potential of a molecule,<br />

a collision with the molecule might lead to its ionization. Therefore, ionizing radiation,<br />

upon interaction with matter, has an ability to remove electrons from atoms resulting in<br />

the formation of ions. The result of this interaction is the production of negatively<br />

charged free electrons and positively charged ions and hence the term “ionizing<br />

radiation”. In other words it can be described as radiation is considered to be ionizing, if<br />

it has a wavelength

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