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accuracy aluminium amplifier angle anode aperture applications astigmatism axial axis capacitance capacitor cathode chromatic aberration circuit coefficient components constant counter curvature depends detection detector devices dose dosemeter effect electrical electronic emulsion energy equipment example exit pupil eyepiece factor field Figure flameproof formulae frequency function Gaussian given glass grid input instrument insulation intrinsic safety ionization chamber lens light limit materials measurement mechanical metal method neutron noise normal object obtained operation optical system output parameters paraxial particle pencil photomultiplier photons plane plastic position possible principal ray principle prism produced proportional counter pulse pupil range raytracing refractive index reliability resistance resistor response scintillation sensitivity shown in Fig signal spherical aberration suitable surface techniques temperature thermal thermal neutrons thin lens tolerance transducer transistor tube usually valve variation voltage wavefront wavefront aberration wavelength wire zener diode zero