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Can we detect the counts of radiation without the ionization inside the tube? 

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It has been shown in a previous paper (Boag, 1950) that ionization measurements in air can be made satisfactorily even at the high intensities which occur in pulsed radiation beams.
Journal ArticleDOI
F. Spurny, Tsvetan Dachev 
01 Mar 2009-Acta Geophysica
11 Citations
Consequently, it is necessary to quantitatively assess the level of exposure to this radiation as the basis for estimating risks due to ionization radiation.
Tube voltages used for these examinations should be kept above 60 kV, whenever possible, to minimise the radiation dose.
In scans obtained with a low tube voltage, the radiation dose can be reduced as much as 56.8%, and higher contrast material enhancement can be achieved.
The results show that the pencil ionization chamber can be used in several radiation beams other than those used in CT.

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