Development of a portable free-air ionization chamber as an absolute intensity monitor for high-energy synchrotron radiation up to 150keV

2004 ◽  
Vol 524 (1-3) ◽  
pp. 324-331 ◽  
Author(s):  
Nobuteru Nariyama ◽  
Noriyuki Kishi ◽  
Seiki Ohnishi
Keyword(s):  
Synchrotron Radiation ◽  
Ionization Chamber ◽  
Absolute Intensity ◽  
High Energy ◽  
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.

scholarly journals Characterization of a free air ionization chamber for low energy X-rays

2016 ◽  
Vol 733 ◽  
pp. 012090
Author(s):  
N F Silva ◽  
M Xavier ◽  
V Vivolo ◽  
L V E Caldas
Keyword(s):  
Ionization Chamber ◽  
Low Energy ◽  
X Rays ◽  
Free Air ◽  
Air Ionization

Diaphragm correction factors for the FAC-IR-300 free-air ionization chamber

2018 ◽  
Vol 132 ◽  
pp. 178-180
Author(s):  
Seyed Mostafa Mohammadi ◽  
Hossein Tavakoli-Anbaran
Keyword(s):  
Ionization Chamber ◽  
Correction Factors ◽  
Free Air ◽  
Air Ionization

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
Sign in / Sign up

Export Citation Format

Share Document