Zobrazeno 1 - 9
of 9
pro vyhledávání: '"T. P. Loftus"'
Autor:
N. Lysak, H. Hashemighouchani, A. Davoudi, N. Pourafshar, T. J. Loftus, M. Ruppert, P. A. Efron, P. Rashidi, A. Bihorac, T. Ozrazgat‐Baslanti
Publikováno v:
BJS Open, Vol 4, Iss 1, Pp 145-156 (2020)
Background Reliable estimates for risk of cardiovascular‐specific mortality and progression to end‐stage renal disease (ESRD) among elderly patients undergoing major surgery are not available. This study aimed to develop simple risk scores to pre
Externí odkaz:
https://doaj.org/article/55835124ab274f9083fd423a0479f2c1
Autor:
T P, Loftus, J T, Weaver
Publikováno v:
Journal of research of the National Bureau of Standards. Section A, Physics and chemistry. (4)
At the National Bureau of Standards (NBS), the exposure-rate standards for (60)Co and (137)Cs gamma rays were based for a number of years on a weighted average of measurements using a cylindrical ionization chamber and a group of small spherical cham
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::ccb89d2f757d11c4b71dfad8350ee2ae
https://pubmed.ncbi.nlm.nih.gov/32189797
https://pubmed.ncbi.nlm.nih.gov/32189797
Publikováno v:
Metrologia. 11:11-15
The exposure rate computed from calorimeter power measurements is compared to the exposure rate of the same source (1-Ci cobalt-60) determined by means of a graphite cavity ionization chamber. A difference of 0.38% was found and is not considered sig
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cdc20698f5ae28990333ca65a0c1d5ee
https://doi.org/10.1088/0026-1394/11/1/004
https://doi.org/10.1088/0026-1394/11/1/004
Publikováno v:
Metrologia. 11:17-23
Comparisons for 60Co gamma rays between the exposure standards of the Bureau International des Poids et Mesures (BIPM), the National Bureau of Standards (NBS) and the Physikalisch-Technische Bundesanstalt (PTB) are reported. For measurements made at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3d6ced1bb22ea8131e0442b2c3bab31d
https://doi.org/10.1088/0026-1394/11/1/005
https://doi.org/10.1088/0026-1394/11/1/005
Publikováno v:
The British Journal of Radiology. 35:65-70
The Canadian and U.S. standard free-air ionization chambers have been compared under identical conditions of X-ray tube kilovoltage and filtration. The comparison shows that the ratio of exposure dose-rate measurements differs from unity by about 0·
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ee8650a03abdfca9b2948172c6443303
https://doi.org/10.1259/0007-1285-35-409-65
https://doi.org/10.1259/0007-1285-35-409-65
Autor:
T. P. Loftus
Publikováno v:
J Res Natl Bur Stand (1977)
A method for calibrating iodine-125 seeds in terms of exposure has been established. The standard free-air ionization chamber, used for measuring soft x rays, was chosen for the measurements. Arrays of four to six seeds were used to enhance the ioniz
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e00c136a097b2374fbd108f3bb88b784
https://doi.org/10.6028/jres.089.017
https://doi.org/10.6028/jres.089.017
Autor:
T. P. Loftus
Publikováno v:
J Res Natl Bur Stand (1977)
Iridium–192, in the form of small platinum-or stainless-steel-clad seeds, is used for radiation therapy. Standardization of this radionuclide, for the quantity exposure was carried out by measuring groups of seeds in an open-air geometry, using the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::830cb6d49e715411c5088e0e75c460e6
https://doi.org/10.6028/jres.085.003
https://doi.org/10.6028/jres.085.003
Publikováno v:
Radiology. 86:149-149
Various authors (1, 2) have indicated the magnitude of the correction required to convert ionization measurements in moist air to a standard condition of dry air. This correction for cavity chamber measurements depends on relative values of stopping
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e1a9b6d0dc66d6580890d41b1f480ead
https://doi.org/10.1148/86.1.149
https://doi.org/10.1148/86.1.149
Autor:
R. M. Lee, T. P. Loftus
Publikováno v:
Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry. :103
Several aspects of the procedure and corrections for the calibration of encapsulated radium sources at NBS have recently been investigated. It was found that a chamber equipped with a guard-ring type electrode system allowing the use of a vibrating r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cb36bd6526246d68ccbbfe08afd3d123
https://doi.org/10.6028/jres.066a.011
https://doi.org/10.6028/jres.066a.011