On the selection of stopping-power and mass energy-absorption coefficient ratios for high-energy x-ray dosimetry

1984 ◽  
Vol 11 (5) ◽  
pp. 618-623 ◽  
Author(s):  
John R. Cunningham ◽  
Robert J. Schulz
Keyword(s):  
Absorption Coefficient ◽  
Energy Absorption ◽  
High Energy ◽  
Stopping Power ◽  
Mass Energy ◽  
X Ray ◽  
Selection Of

Mean mass energy absorption coefficient ratios for megavoltage x-ray beams

1995 ◽  
Vol 22 (5) ◽  
pp. 525-530 ◽  
Author(s):  
Eli E. Furhang ◽  
Chen-Shou Chui ◽  
Michael Lovelock
Keyword(s):  
Absorption Coefficient ◽  
Energy Absorption ◽  
Mass Energy ◽  
X Ray

Measurement of the x-ray mass energy-absorption coefficient of air using 3 keV to 10 keV synchrotron radiation

2006 ◽  
Vol 51 (20) ◽  
pp. 5125-5150 ◽  
Author(s):  
L Büermann ◽  
B Grosswendt ◽  
H-M Kramer ◽  
H-J Selbach ◽  
M Gerlach ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Absorption Coefficient ◽  
Energy Absorption ◽  
Mass Energy ◽  
X Ray

Stopping-power and mass energy-absorption coefficient ratios for Solid Water

1986 ◽  
Vol 13 (3) ◽  
pp. 403-404 ◽  
Author(s):  
Anthony K. Ho ◽  
Bhudatt R. Paliwal
Keyword(s):  
Absorption Coefficient ◽  
Energy Absorption ◽  
Stopping Power ◽  
Mass Energy ◽  
Solid Water

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.

scholarly journals RECENT DEVELOPMENTS IN THE SEARCH FOR COMPTON-THICK AGN

2013 ◽  
Vol 23 ◽  
pp. 1-10 ◽  
Author(s):  
I. GEORGANTOPOULOS
Keyword(s):  
Galactic Nuclei ◽  
Optical Emission ◽  
High Energy ◽  
X Ray ◽  
Recent Developments ◽  
Complementary Techniques ◽  
Low X ◽  
Optical Surveys ◽  
Absorption Features ◽  
Selection Of

I present a review of X-ray and mid-IR surveys for Compton-thick Active Galactic Nuclei (AGN). These are the most highly obscured sources having hydrogen column densities > 1.5 × 1024 cm-2. Key surveys in the local Universe are presented including the high energy SWIFT/BAT and INTEGRAL surveys, mid-IR and also optical surveys. Recently, deep X-ray surveys with Chandra and XMM-Newton have produced a number of candidate Compton-thick AGN at higher redshift primarily in the Chandra Deep Field South region. In addition, mid-IR surveys with Spitzer have helped to develop novel complementary techniques for the selection of Compton-thick AGN. The mid-IR techniques used to identify Compton-thick AGN include: a) 24 μm excess sources relative to their optical emission b) Spitzer spectroscopy for the detection of high optical depth Si 9.7μm absorption features c) low X-ray to 6μm luminosity ratio.

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