Gaseous Radiation Detectors Research Articles

Stand-alone PC-based fast readout electronics and software for 2D-gaseous detectors

A novel readout system based on time signals processing and digitization for 2-D gaseous radiation detectors is presented. It is comprised of fast amplifiers, constant fraction discriminators, a dedicated 486 PC/AT-born time-to-digital converter and data acquisition boards and software. Its software package runs under Windows 3.1. The system allows for fast real-time data acquisition as well as for on-line and off-line data processing and image analysis. At event rates reaching 3 kHz this readout system provides an efficient and convenient tool for laboratory tests. It can operate at higher rates, exceeding 0.5 MHz under DOS. The entire system is stand-alone and does not require any additional electronics. It can operate under both external and self-triggering modes. The novel system is versatile and may be applied for the readout of a large variety of gaseous imaging detectors. Images acquired by X-ray and β imaging avalanche gas detectors equipped with this electronic system and using the software package are presented.

Monte Carlo simulation of x-ray absorption and electron drift in gaseous xenon.

A detailed Monte Carlo simulation model has been developed to study the absorption of soft x rays and the subsequent behavior of the resulting electrons under the influence of an applied electric field in gaseous xenon. All relevant physical processes are included from the initial photoionization through the subsequent decay of the residual ion to the scattering and drift of the electrons resulting from the interactions with the background gas. Details are provided for the cross sections and decay rates employed as well as the criteria used to terminate the simulation, depending on the information or results required. Examples of its use in modeling gaseous radiation detectors are included.

The energy linearity of gaseous xenon radiation detectors for X-rays with energies between 2 and 60 keV: Experimental results

Abstract The energy linearity of gaseous xenon radiation detectors for X-rays in the 2 to 60 keV energy range has been shown experimentally to have a noticeable discontinuous decrease of 92 ± 10 eV near the 4.8 keV L shell threshold. Apart from this discontinuity the behaviour is practically linear. A discussion of the results is presented.