ANSWER:
Function of Ionization Chamber:
In ionization chamber, fast moving electrons are thrown upon the vapours of the substance. The atoms of the isotopic element are converted into positively charged ions.
![Dempsters-mass-spectrometer](https://exceptionaleducations.com/wp-content/uploads/2024/03/Dempsters-mass-spectrometer.jpg)
(Ref. An Insight Into Objective Chemsitry-11, Ch-01, Q. No. 23)