CHAPTER 4: Generation of X-rays

CHAPTER 4: Generation of X-rays

1. Target will produce X-ray through Berillium window
2. Berillium window placed at direction at 6 degree from anode surface

Discuss:
(i) electron at cathode
(ii) electron collide at anode
(iii)X-ray at Cu

Component of X-ray tube:
-evacuated glass tube, filament & an anode
-filament (tungsten) (high heat resistance)
-target, Cu is most used

Production of X-rays:

Actual design of X-ray tube

1. Target will produce X-ray through Berillium window
2. Berillium window placed at direction at 6 degree from anode surface

X-ray spectrum

(a) continuous specttrum

(b)characteristic spectrum (importance)

use this to reduce Kβ & continuous graph

Kα-kβ Radiation

Kα radiation is energy radiated when electron move from plane n=2 to n=1

Moseley's Law

X-ray radiation is characteristic of the energy liberated during the electron ttransition

The characteristic X-ray frequencies (1/λ) increase regularly with atomic number Z

The wave number changed systematically with photon number when we changed the element.

V ^½ =A(Z – Z 0)