scholarly journals Conception and realization of a parallel-plate free-air ionization chamber for the absolute dosimetry of an ultrasoft X-ray beam

2014 ◽  
Vol 85 (8) ◽  
pp. 083304 ◽  
Author(s):  
J.-E. Groetz ◽  
N. Ounoughi ◽  
C. Mavon ◽  
A. Belafrites ◽  
M. Fromm
Keyword(s):  
Ionization Chamber ◽  
Parallel Plate ◽  
X Ray ◽  
Free Air ◽  
Air Ionization ◽  
The Absolute

Free-air ionization chamber, FAC-IR-300, designed for medium energy X-ray dosimetry

2017 ◽  
Vol 12 (01) ◽  
pp. T01008-T01008 ◽  
Author(s):  
S.M. Mohammadi ◽  
H. Tavakoli-Anbaran ◽  
H.Z. Zeinali
Keyword(s):  
Ionization Chamber ◽  
Medium Energy ◽  
X Ray ◽  
Free Air ◽  
Air Ionization

Design and preliminary test of a free-air ionization chamber for low-energy X-ray

2011 ◽  
Vol 35 (6) ◽  
pp. 576-579 ◽  
Author(s):  
Jin-Jie Wu ◽  
Yuan-Di Yang ◽  
Pei-Wei Wang ◽  
Jing Chen ◽  
Jia-Cheng Liu
Keyword(s):  
Ionization Chamber ◽  
Preliminary Test ◽  
Low Energy ◽  
X Ray ◽  
Free Air ◽  
Air Ionization

Design of the free-air ionization chamber, FAC-IR-150, for X-ray dosimetry

2018 ◽  
Vol 144 ◽  
pp. 344-350
Author(s):  
Seyed Mostafa Mohammadi ◽  
Hossein Tavakoli-Anbaran
Keyword(s):  
Ionization Chamber ◽  
X Ray ◽  
Free Air ◽  
Air Ionization

The NMIJ air kerma primary standard for high energy X-ray beams in 300-450 kV

2021 ◽  
Author(s):  
Junya Ishii ◽  
Tadahiro Kurosawa ◽  
Masahiro Kato
Keyword(s):  
Energy Range ◽  
Ionization Chamber ◽  
Primary Standard ◽  
High Energy ◽  
National Metrology Institute ◽  
X Ray ◽  
Free Air ◽  
Relative Standard ◽  
Air Ionization ◽  
Calibration Coefficients

Abstract Accurate radiation dosimetry is required for radiation protection in various environments. Therefore, dosemeters and dose-rate meters must be calibrated in standard radiation fields. The National Metrology Institute of Japan (NMIJ) expands the energy range of X-ray reference field measurement up to 450 kV using a cylindrical graphite-walled cavity ionization chamber. Departure from the condition of the Spencer-Attix cavity theory was evaluated by comparing the measurement results obtained using the cavity ionization and the free-air ionization chambers, which are used as the primary standard up to a tube voltage of 250 kV. The calibration coefficients found using the spherical ionization chamber were in good agreement with those obtained by the free-air ionization chamber within relative standard uncertainties (k = 1) for N-200 and N-250 X-ray fields. Consistent calibration coefficients were obtained in the energy range 300–450 kV.

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