Abstract
Nanodosimetry is a technique that measures the energy deposited by ionizing radiation under the principle of ion induced impact ionization in low pressure gas volume which correlates the number of ionization produced in nanometric scale of the DNA. In the modern field of nanodosimetry, the multilayer Printed Circuit Board (PCB) technology based 3D positive ion detector plays a more prominent role in the field of radiation biology, radiation dosimetry, oncology, and also as gamma spectrometer and gas sensor. The present study is targeted to analyze the performance of the 3D positive ion detector as gas sensor under propane, methane, argon, nitrogen, and air medium at various pressures ranging from 0 to 10 Torr using Co-60 source. From this study, it is observed that the detector shows varying magnitude in its efficiency and amplitude under different media with a maximum efficiency of 12.286% and amplitude of 168 V under propone medium at 0.9 Torr. The detector also shows variation in its cluster size distribution and ion drift time under different media. Hence, it is concluded that the 3D positive ion detector can be considered as a gas sensor.
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