1998
DOI: 10.1088/0031-9155/43/8/005
|View full text |Cite
|
Sign up to set email alerts
|

Volume recombination parameter in ionization chambers

Abstract: The parameter m2 governing the volume recombination in ionization chambers has been measured under conditions which allow strict application of the basic theory. The method consists of measuring the ratio of ionization currents I(V1) and I(V2) obtained at two given voltages V1 and V2 as a function of I(V1). The value of m2 is derived from a linear extrapolation to zero current. Several pairs of voltages (V1, V2) were used. The value of m2 obtained in this work is 3.97 x 10(14) s m(-1) C(-1) V(2) with a relativ… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1
1
1

Citation Types

4
62
0
1

Year Published

2005
2005
2022
2022

Publication Types

Select...
7
1

Relationship

0
8

Authors

Journals

citations
Cited by 80 publications
(67 citation statements)
references
References 22 publications
(23 reference statements)
4
62
0
1
Order By: Relevance
“…Based on the conclusion of Palmans et al., that a cyclotron proton beam should be treated as a purely continuous beam, and assuming that this also applies to a scanned beam, the k s value was calculated according to the formula derived from Boag's theoretical model:ks=1+m2d46vV2·Isatwhere m2 is a parameter representing volume recombination, as given by Boutillon et al., d is the electrode spacing, v is the volume of the ionization chamber, Iitalicsat is the ionization current, and V is the chamber voltage. The parameter m2 is a property of the gas in the cavity and it value depends on the recombination coefficient and on the mobility of negative and positive ions in the gas.…”
Section: Methodsmentioning
confidence: 99%
“…Based on the conclusion of Palmans et al., that a cyclotron proton beam should be treated as a purely continuous beam, and assuming that this also applies to a scanned beam, the k s value was calculated according to the formula derived from Boag's theoretical model:ks=1+m2d46vV2·Isatwhere m2 is a parameter representing volume recombination, as given by Boutillon et al., d is the electrode spacing, v is the volume of the ionization chamber, Iitalicsat is the ionization current, and V is the chamber voltage. The parameter m2 is a property of the gas in the cavity and it value depends on the recombination coefficient and on the mobility of negative and positive ions in the gas.…”
Section: Methodsmentioning
confidence: 99%
“…For continuous radiation, previously developed models for deriving the recombination parameters at different dose rates and different polarizations can be used. The ratio of the saturation current I sat and the current I V at operating voltage V for continuous beams can be approximated by 19,20…”
Section: Iia1 Continuous 60 Co Gamma Radiationmentioning
confidence: 99%
“…Expressing Eq. ͑1͒ for two values of the polarizing voltage V and V / n, where n is not necessarily an integer, and dividing both expressions yields approximately 19,20…”
Section: Iia1 Continuous 60 Co Gamma Radiationmentioning
confidence: 99%
“…However, when a proper correction is required initial recombination in continuous beams should not be neglected. In this case k s can be approximated by using a method described by Boutillon [37]. This method evaluates the recombination correction including both the initial and general recombination component.…”
Section: Recombination Correctionmentioning
confidence: 99%