Abstract
Abstract
In order to make a microdosimeter, it is first necessary to
investigate the parameters affecting the electric field of the
microdosimeter, such as the presence of the helix, the thickness and
voltage of the helix, the radius and the number of its rings, as
well as the thickness and voltage of the anode, and obtain its
optimal conditions. In order to obtain the optimal conditions of the
electric field, things such as the possibility of manufacturing, no
electric discharge, increasing the intensity of the electric field
at a constant voltage, energy resolution, continuity of the electric
field with the presence of a helix, and a significant increase in
multiplication in a small volume of the microdosimeter around the
anode have been considered. Since the presence of the helix
complicates the analytical solution of the problem, therefore, using
the COMSOL simulation code, we investigated the various parameters
of the electric field. Finally, for the cylindrical anode with a
height of 25 mm, in optimal conditions; the thickness of the anode
was obtained 0.4 mm, a helix with a thickness of 0.6 mm and a
radius of 1.5 mm was obtained, which has 9 rings coaxially with the
anode. Therefore, the obtained values can be used to make
microdosimetry with the geometric dimensions of 25 mm right
cylinders, which can investigate microdosimetry sites with different
dimensions by changing the pressure of the gas density inside it.