Initial and volume recombination losses in gamma versatile ionization chamber VGIC for gamma ray dosimetry

Fares, Mohamed; Messai, A.; Messaoudi, Mohammed; Negara, Kassida; Debili, M.Y.; Begaa, Samir

doi:10.1016/j.apradiso.2021.109794

Cited by 1 publication

(2 citation statements)

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“…Dosimetry based on local ion recombination is not currently being developed in research institutes other than NCBJ. There are studies in the literature that refer to the occurrence of the local recombination of ions in the gas during the detection of ionizing radiation, but it is treated only as a phenomenon that worsens the measurement properties of the detectors [ 3 , 4 ].…”

Section: Methodsmentioning

confidence: 99%

“…The technique of measuring low current values (above 1 fA), called electrometry, is an unpopular field of electronics, especially when the source of the measured signal is a device with a large volume (in the order of 1-10 dm 3 ), electrical capacitance in the order of 100 pF and is sensitive to environmental conditions and vibration. This paper presents a description and a validation of a new low current measurement algorithm for use in gas detector-based dosimetry, using the REM-2 type recombination chamber as an example [1].…”

Section: Introductionmentioning

confidence: 99%

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A Sub-Picoampere Measurement Algorithm for Use in Dosimetry of Time-Varying Radiation Fields

Kuć,

Maciak,

Tulik

2024

Sensors

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Dosimetry based on gas detectors operating in the recombination and saturation region provides unique research opportunities but requires high-quality electrometers with a measuring range below 1 pA (10−12 A). The standard approach in electrometry is to strive to increase the accuracy and precision of the measurement, ignoring the importance of its duration. The article presents an algorithm for the measurement of low current values (from 100 fA) that allows both a fast measurement (with a step of 2.3 ms) and high accuracy (measurement error below 0.1%), depending on the measurement conditions and the expected results. A series of tests and validations of the algorithm were carried out in a measurement system with a Keithley 6517B electrometer and a REM-2 recombination chamber under conditions of constant and time-varying radiation fields. The result of the work is a set of parameters that allow for the optimisation of the operation of the algorithm, maximising the quality of the measurements according to needs and the expected results. The algorithm can be used in low current measurement systems, e.g., for dosimetry of mixed radiation fields using recombination methods and chambers.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%