1. Name four commonly used light sources in therapeutic and diagnostic biomedica

Question

1. Name four commonly used light sources in therapeutic and diagnostic biomedical applications. Discuss their advantages/disadvantages over other conventional techniques.

2. Describe the three fundamental radiation processes associated with the interaction of light with matter. Elucidate the role they play for the laser operation.

3. Give three examples for the application of lasers. How do they make use of the special properties of laser light?

4. The krypton ion laser has become very significant for ophthalmic applications. Describe how the laser works. Draw the relevant energy levels.

Explanation / Answer

1] The four commonly used light sources in therapeutic and diagnostic biomedical applications are

2] The three fundamental radiation processes associated with the interaction of light with matter are

Photon Interactions-

There are two kinds of interactions through which photons deposit their energy; both are with electrons. In one type of interaction the photon loses all its energy; in the other, it loses a portion of its energy, and the remaining energy is scattered.

Compton interaction is one in which only a portion of the energy is absorbed and a photon is produced with reduced energy and the photon leaves the site of the interaction in a direction different from that of the original photon.

In a pair-production interaction, the photon interacts with the nucleus in such a manner that its energy is converted into matter, it can occur only with photons with energies in excess of 1.02 MeV.

3] a] Science, lasers are used in many ways, including

b] Medical Uses of Lasers

c] Welding and Cutting

In a pair-production interaction, the photon interacts with the nucleus in such a manner that its energy is converted into matter, it can occur only with photons with energies in excess of 1.02 MeV.

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