Results 251 to 260 of about 6,005,333 (282)

Alterations in Dose and Lineal Energy Spectra Under Different Shieldings in the Los Alamos High-Energy Neutron Field

Radiation Research, 2000
Nuclear interactions of space radiation with shielding materials result in alterations in dose and lineal energy spectra that depend on the specific elemental composition, density and thickness of the material. The shielding characteristics of materials have been studied using charged-particle beams and radiation transport models by examining the risk ...
Richard Wilkins, Gautam D Badhwar, G D Badhwar   +2 more
exaly   +3 more sources

Measurement and simulation of lineal energy distribution at the CERN high energy facility with a tissue equivalent proportional counter

Radiation Protection Dosimetry, 2006
The response of a tissue equivalent proportional counter (TEPC) in a mixed radiation field with a neutron energy distribution similar to the radiation field at commercial flight altitudes has been studied. The measurements have been done at the CERN-EU High-Energy Reference Field (CERF) facility where a well-characterised radiation field is available ...
S, Rollet, M, Autischer, P, Beck, M, Latocha   +3 more
openaire   +2 more sources

Variance-Covariance Measurements of the Dose Mean Lineal Energy in Beams for Radiotherapy

Radiation Protection Dosimetry, 1990
Abstract An experimental arrangement to perform variance-covariance measurements, based on tissue-equivalent proportional counters, is described. Results in a narrow beam geometry for 8 and 16 MV X rays from a medical linear accelerator are given and compared with data from the literature. It is concluded that the method is applicable
H.B. Honoré, K.A. Jessen, H.H. Nielsen
openaire   +1 more source

A method to modify the lineal energy-based quality factor for semiconductor microdosiemeters

Radiation Measurements, 2018
Abstract A lineal energy-based quality factor, Q ( y ) , has been provided for a spherical sensitive volume (SV) of 1 μm diameter. Significant errors may occur in determination of the dose equivalent by application of this quality factor to larger SVs as is common for semiconductor microdosiemeters.
Firouz Payervand, Gholamreza Raisali, Amir Moslehi   +2 more
openaire   +1 more source

Lineal energy calibration of mini tissue-equivalent gas-proportional counters (TEPC)

AIP Conference Proceedings, 2013
Mini TEPCs are cylindrical gas proportional counters of 1 mm or less of sensitive volume diameter. The lineal energy calibration of these tiny counters can be performed with an external gamma-ray source. However, to do that, first a method to get a simple and precise spectral mark has to be found and then the keV/μm value of this mark. A precise method
V. Conte, D. Moro, B. Grosswendt, P. Colautti   +3 more
openaire   +1 more source

Lineal DNA logic gate for microRNA diagnostics with strand displacement and fluorescence resonance energy transfer

Chinese Chemical Letters, 2015
Abstract Designing molecular logic gates to operate programmably for molecular diagnostics in molecular computing still remains challenging. Here, we designed a novel linear DNA logic gates for microRNA analysis based on strand displacement and fluorescence resonance energy transfer (FRET).
Tian-Tian Meng, Ying-Xin Liu, Meng-Tan Liu, Jiao-Bao Long, Qing-Feng Cao, Shu-Ya Yan, Xiang-Xian Meng   +6 more
openaire   +1 more source

Monte Carlo simulation of fast neutron spectra: Mean lineal energy estimation with an effectiveness function and correlation to RBE

International Journal of Radiation Oncology*Biology*Physics, 2001
Intercomparisons of radiotherapy trials conducted at different fast neutron facilities are complicated by the dependence of the relative biologic effectiveness (RBE) of the different beams on the fast neutrons spectra. To obtain a better understanding of the influence of neutron energy on radiation quality, Monte Carlo simulations were performed to ...
J, Pignol, J, Slabbert, P, Binns
openaire   +2 more sources

Measurement of Lineal-energy Distributions for Neutrons of 8 keV to 65 MeV by Using a Tissue-equivalent Proportional Counter

Radiation Protection Dosimetry, 2002
The lineal-energy spectra for monoenergetic and quasi-monoenergetic neutrons of 8 keV to 65 MeV were obtained using a tissue-equivalent proportional counter (TEPC). The frequency-mean lineal energy, the dose-average lineal energy and mean quality factor were estimated from the measured data.
T. Nunomiya, E. Kim, T. Kurosawa, S. Taniguchi, S. Yonai, T. Nakamura, Y. Nakane, Y. Sakamoto, S. Tanaka   +8 more
openaire   +2 more sources

Differential absorbed dose distributions in lineal energy for neutrons and gamma rays at the mono-energetic neutron calibration facility

Radiation Protection Dosimetry, 2005
Absorbed dose distributions in lineal energy for neutrons and gamma rays of mono-energetic neutron sources from 140 keV to 15 MeV were measured in the Fast Neutron Laboratory at Tohoku University. By using both a tissue-equivalent plastic walled counter and a graphite-walled low-pressure proportional counter, absorbed dose distributions in lineal ...
M, Takada, M, Baba, H, Yamaguchi, K, Fujitaka   +3 more
openaire   +2 more sources

Measurements of Lineal Energy Spectra for Neutron Capture Therapy Using a Boron Doped Let Chamber

1992
Preclinical studies for boron neutron capture therapy (BNCT) using epithermal neutrons are ongoing at several laboratories. The absorbed dose in tumor cells depends on the boron concentration, thermal neutron flux at depth, size of the cell, plus fast neutron and gamma contamination in the epithermal beam.
H. I. Amols, C. S. Wuu, S. Saraf, P. Kliauga, L. E. Reinstein   +4 more
openaire   +1 more source