Fast counting of alpha particles in air ionization chambers

Measurement of Field Distortion in Free-Air Ionization Chambers

A two dimensional allaJog of a free-air ionization chamber for the measurement of fi eld distortion was obtained by painting conducting lines on resistance paper to represent cross sections of the electrodes. Guard wires were simulated by driving record p layer needles into the paper . The volume of the chamber from which charge was collected was related to the resistance between two of the lin...

Ionization defect for alpha particles in various gases

The ionization produced by the Li7* and o<-particles from the reaction BlO(njo<)Li7* as they were stopped in argonj argon-nitrogen~ and argoncarbon dioxide gas mixtures was measured. A gridded parallel-plate ionization chamber employing electron collection was used. Plutonium alpha particles were used for calibration and the ionization electron pulses were amplified and sorted-with an electroni...

Bayesian Analysis of Alpha-Particles and Protons Nanodosimetric Ionization Distributions

Radiobiological data suggest that track quality depends on the statistical properties of ionization events in a biologically significant site of nanometric size. Such statistical properties can be studied experimentally with a track-nanodosimetric counter based on single electron detection mounted on a beam line of the Tandem-Alpi INFN Legnaro National Laboratories particle accelerator complex ...

Standard calibration of ionization chambers used in radiation therapy dosimetry and evaluation of uncertainties

Background: Absolute dosimetry of external beam radiotherapy is carried out by the use of ionization chambers. These chambers must be calibrated at a standard dosimetry laboratory before any use in clinical dosimetry. The secondary standard dosimetry laboratory of Iran (SSDL) has the duty of calibrating the ionization chambers used in radiotherapy centers in Iran. Materials and Methods...

Ionization-excitation of helium by fast charged particles.