Angular Dependence Factors and Air Kerma to Dose Equivalent Conversion Coefficients for 1.9 cm Rod and 7.3 cm Pillar Phantoms Irradiated by Extended Monodirectional X Ray Beams

1995 ◽  
Vol 59 (3) ◽  
pp. 181-193
Author(s):  
B. Grosswendt
Keyword(s):  
Angular Dependence ◽  
Dose Equivalent ◽  
X Ray ◽  
Air Kerma ◽  
Conversion Coefficients

INFLUENCE OF NEW MASS ENERGY-ABSORPTION COEFFICIENTS FROM ICRU REPORT NO. 90 ON AIR KERMA TO DOSE EQUIVALENT CONVERSION COEFFICIENTS

2018 ◽  
Vol 185 (1) ◽  
pp. 27-33
Author(s):  
Katharina Bairlein ◽  
Oliver Hupe
Keyword(s):  
Energy Absorption ◽  
Radiation Protection ◽  
Cross Sections ◽  
Mass Energy ◽  
Dose Equivalent ◽  
Absorption Coefficients ◽  
X Ray ◽  
Air Kerma ◽  
Conversion Coefficients ◽  
Operational Quantities

Abstract In Report No. 90 of the International Commission on Radiation Units and Measurements (ICRU), new mass energy-absorption coefficients are listed which are based on renormalized Scofield photoeffect cross-sections. The mass energy-absorption coefficients are the basis for the conversion coefficients from air kerma to the operational quantities listed in ISO 4037-3. Although ICRU does not give a recommendation if these new mass energy-absorption coefficients should be applied instead of the values used so far, an examination of the possible consequences for radiation protection quantities is necessary. We calculated the conversion coefficients for the X-ray qualities specified in ISO 4037-1 with the new mass energy-absorption coefficients and with the mass energy-absorption coefficients used so far to determine the deviations. Our calculations show that the change of the conversion coefficients due to the new values from ICRU Report No. 90 is negligible.

Measurement of conversion coefficients between free in air kerma and personal dose equivalent for diagnostic X-ray beams

2008 ◽  
Vol 43 (2-6) ◽  
pp. 968-971 ◽  
Author(s):  
P.H.G. Rosado ◽  
M.S. Nogueira ◽  
F. Genezini ◽  
E.C. Vilela
Keyword(s):  
Dose Equivalent ◽  
X Ray ◽  
Air Kerma ◽  
Conversion Coefficients

DEVELOPMENT OF A NEW SECONDARY STANDARD FOR H*(10)

2020 ◽  
Vol 188 (3) ◽  
pp. 378-382
Author(s):  
K Bairlein ◽  
B Behnke ◽  
O Hupe
Keyword(s):  
Ionization Chamber ◽  
Secondary Standard ◽  
Dose Equivalent ◽  
Air Kerma ◽  
Radiation Fields ◽  
Ambient Dose Equivalent ◽  
Conversion Coefficients ◽  
Aluminium Coating ◽  
Pulsed Fields ◽  
Ambient Dose

Abstract A secondary standard for ambient dose equivalent, H*(10), is necessary for the dissemination of the unit Sievert (Sv), but there is no such standard commercially available currently. Furthermore, the measurement of H*(10) instead of calculating H*(10) from air kerma and conversion coefficients is needed for unknown radiation fields. We developed a prototype of a new secondary standard for H*(10) based on a spherical 1 l ionization chamber for air kerma. This chamber was modified with copper wires at the inner surface to adjust the response of the chamber according to H*(10). Additionally, a Makrolon shell and an aluminium coating were added to optimize the response at energies below 50 keV. The prototype fulfils the requirements given in ISO 4037-2 in the energy range from 12 keV to 7 MeV. In combination with an electrometer, it can be used as area dosemeter, suitable for pulsed fields and for low energy radiation.

Conversion coefficients from air kerma to personal dose equivalent in mammography

2010 ◽  
Vol 79 (5) ◽  
pp. 594-596 ◽  
Author(s):  
R. Künzel ◽  
R.S. Levenhagen ◽  
S.B. Herdade
Keyword(s):  
Dose Equivalent ◽  
Air Kerma ◽  
Conversion Coefficients

Determination of conversion factors from air kerma to operational dose equivalent quantities for low-energy X-ray spectra

2006 ◽  
Vol 125 (1-4) ◽  
pp. 198-204 ◽  
Author(s):  
A. Hakanen ◽  
A. Kosunen ◽  
P. Poyry ◽  
M. Tapiovaara
Keyword(s):  
Low Energy ◽  
Dose Equivalent ◽  
Conversion Factors ◽  
X Ray ◽  
Air Kerma
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