Results 121 to 130 of about 2,824 (166)

Air kerma rate constants for radionuclides

European Journal of Nuclear Medicine and Molecular Imaging, 1988
Conversion to SI units requires that the exposure rate constant which was usually quoted in R.h-1.mCi-1.cm2 be replaced by the air kerma rate constant with units m2.Gy.Bq-1.s-1. The conversion factor is derived and air kerma rate constants for 30 radionuclides used in nuclear medicine and brachytherapy are listed.
Herman Wasserman, Wasserman Herman
exaly   +3 more sources

Spectra and air-kerma strength for encapsulated 192Ir sources

Medical Physics, 1999
The photon spectra in vacuum around four types of 192Ir HDR brachytherapy sources are calculated using the Monte Carlo code EGS4 and the most recent spectral information on 192Ir decay. The air-kerma strengths per unit activity are calculated based on the photon fluence around a bare 192Ir source and around each of four types of encapsulated sources ...
Jette Borg, David W O Rogers
exaly   +4 more sources

Lowering air kerma to improve the CTO operator's karma

Catheterization and Cardiovascular Interventions, 2023
Key Points Along with the implementation of protection devices and procedural techniques, optimizing fluoroscopic protocols is a crucial step to reduce radiation dose to cath‐lab operators According to this retrospective study, using an ultra‐low dose fluoroscopy protocol (3.75 frames per second) is a simple, effective, and safe way to reduce radiation
Stefano Rigattieri, Matteo Casenghi
openaire   +2 more sources

Air kerma rate from radionuclides distributed in forest ecosystem

Journal of Environmental Radioactivity, 2023
This study evaluates the air kerma rate in radioactively contaminated forests. The air kerma rates created by plane sources of monoenergetic photons in the energy range 0.02-3 MeV located at different depths in soil up to 50 g cm-2 and at different heights in the forest medium from 0.05 to 50 m were calculated using numeric solution of the transport ...
V Yu Golikov
exaly   +3 more sources

THE AIR-KERMA RATE CONSTANT: APPLICATION TO AIR-KERMA MEASUREMENTS FOR HOMELAND SECURITY

Health Physics, 2008
Air-kerma rate measurements from 57Co, 60Co, and 137Cs radioactive sources were performed. These measurements were motivated by the development of new sources at the National Institute of Standards and Technology (NIST) for radiological testing of equipment for homeland security applications.
L, Pibida, R, Minniti, L, Lucas, S M, Seltzer   +3 more
openaire   +2 more sources

The Air-kerma Rate Constant of 192Ir

Health Physics, 1993
The air-kerma rate constant gamma delta (and its precursors), as one of the basic radiation characteristics of 192Ir, was determined by many authors. Analysis of accessible data on this quantity led us to the conclusion that published data strongly disagree.
M M, Ninković, J J, Raiĉevìć
openaire   +2 more sources

Reference air kerma and kerma‐area product as estimators of peak skin dose for fluoroscopically guided interventions [PDF]

Medical Physics, 2011
Purpose:To determine more accurate regression formulas for estimating peak skin dose (PSD) from reference air kerma (RAK) or kerma‐area product (KAP).Methods:After grouping of the data from 21 procedures into 13 clinically similar groups, assessments were made of optimal clustering using the Bayesian information criterion to obtain the optimal linear ...
Deukwoo Kwon, Mark P Little, Donald L Miller   +2 more
exaly   +3 more sources

Calculation of air-kerma rate of diagnostic X-ray generators

Radiological Physics and Technology, 2010
As one type of basic physical data related to the calculation of the construction of X-ray examination room shielding, we investigated the air-kerma rate 1 m from the source of the useful beam focus per unit current time product. Compared to the X-ray energy penetration values obtained in prior research, we obtained higher values. We found three causes
Yoh Katoh, Masahiro Fukushi, Abe Shinji   +2 more
exaly   +3 more sources

A new Diamentor for measuring kerma‐area product and air‐kerma simultaneously

Medical Physics, 1997
The new M4KDK Diamentor (PTW‐Freiburg) for measuring the air‐kerma‐area product (KAP) and air kerma (AK) simultaneously was evaluated. The special design of the Diamentor chamber influences the variation of the calibration factor with respect to the field size somewhat differently to what is the case with the classic Diamentor.
H, Gfirtner, F E, Stieve, J, Wild
openaire   +2 more sources

Significance and feasibility of air kerma length product and air kerma area product comparisons

Radiation Measurements
Air kerma length product and air kerma area product are special quantities used in diagnostic radiology. They are measured using special measurement devices – CT-chambers and KAP-meters, in order to calculate quantities related to patient exposure.
Miloš Zivanovic, Nikola Kržanović
exaly   +3 more sources