X rays Flashcards
What is the order of wavelength of X-rays?
-11 to -9
How is the intensity and quality of X-rays controlled in the Coolidge apparatus?`
- The intensity can be controlled by increasing or decreasing the filament current.
- The quality of X-rays can be controlled by controlling the accelerating potential.
Explain the phenomenon of continuous X-ray spectrum?
When accelerating electrons enter the nucleus’s vicinity, the deceleration starts and the electrons lose their energy. This energy appears as an electromagnetic pulse. By this process, X-rays of continuous wavelength within a certain range can be obtained.
State Moesely’s Law
The frequency of a spectral line in the characteristic X-ray spectrum varies as the square of the atomic number of the element emitting it.
How is the production of X-ray opposite to the photoelectric effect?
Because in X-ray production, kinetic energy is converted into the radiation of energy hv.
What do you mean by breaking radiation?
Fill in the answer once you know it.
What is the screening effect?
Please write in precise terms. At the time of this note-taking, I don’t know.
How is the screening effect accounted for in Moseley’s law’s mathematical formulation?
This is accounted for by writing Z-b in place of Z, where b is the screening constant. The Z- b is an approximation rather than the constant derived from theories.
What is the change(decrease) of the intensity of X-ray proportional to, when passing through an absorbing medium?
dI is proportional to initial intensity Io and dx, i.e. the distance travelled through the medium.
What is the half-value layer?
In the case of absorption of X-ray, the half-value layer is the thickness of the absorber for which the intensity reduces to half of its value. It is denoted by Chi sub-H.
