Question

Which of the following can be done to avoid loss of intensities of X-rays due to the absorption of long wavelength X-rays?

(a) Apparatus must be contained in a chamber

(b) Air in the chamber must be replaced by helium

(c) Inert gas atmosphere must be provided

(d) Proper slits must be used

I had been asked this question in final exam.

Question is from X-Ray Fluorescent Spectrometer in portion X-Ray Spectrometers of Analytical Instrumentation

Answer 1

Right answer is (b) Air in the chamber must be replaced by helium

Best explanation: Air in the chamber must be replaced by helium to avoid loss of intensities of X-rays due to the absorption of long wavelength X-rays. Vacuum chambers can also be used.