Results 211 to 220 of about 5,026 (252)

DNA Radiolysis by Fast Neutrons

International Journal of Radiation Biology, 1990
The effects of fast neutron irradiation on DNA were studied using DNA of the pBR322 plasmid (4362 base pairs), and the results compared to those obtained with 60Co gamma rays. Irradiation of the plasmid DNA in solution with a neutrons beam (p34+Be) of the CERI (CNRS Orléans) cyclotron (with a flat energy spectrum from 34 MeV to low energies) results in
M, Spotheim-Maurizot, M, Charlier, R, Sabattier   +2 more
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Fast Neutron Radiation Therapy

Annual Review of Biophysics and Bioengineering, 1982
Cancer therapy continues to advance on two fronts concerned respec­ tively with ablation of local and regional disease by surgery or radiation and control of distant spread or dissemination by immunotherapy and chemotherapy. Local control of nonresectable cancer by irradiation fre­ quently fails (in about one-third of patients referred) owing to a ...
L, Cohen, M, Awschalom
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Fast neutron radiation therapy

Critical Reviews in Oncology/Hematology, 1992
Fast neutron radiation therapy was first used as a cancer treatment tool by Robert Stone at the Lawrence Berkeley Laboratory in 1938 [l]. Using the Berkeley cyclotron, Dr. Stone treated a series of patients with advanced malignancies in various locations to high doses.
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Medical radiography with fast neutrons

The British Journal of Radiology, 1973
Abstract Neutrograms of patients are being taken during the course of radiotherapy with the fast neutron beam from the MRC cyclotron. A combination of industrial X ray film with radiographic salt screens is used so that the cassette can be left in position during most (or all) of a treatment.
D K, Bewley, M, Catterall, B C, Page
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A Fast Neutron Source for Radiotherapy

Nature, 1964
ONE of the factors which may determine the effectiveness of an X-ray treatment is the oxygen tension in the tumour to be destroyed, in that the radiation is relatively less effective in killing the anoxic cells at the centre. This was demonstrated by Gray et al.1, who also showed that the biological effects produced by 2.3-MeV neutrons are much less ...
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Irradiation of the Microvasculature with Fast Neutrons

Radiology, 1979
Single- and split-dose irradiation of the eyes of dogs was performed with cyclotron-produced polyenergetic neutrons at a rate of about 0.2 Gy (20 rad) per minute. Neovascularization was subsequently induced surgically in the avascular corneas and stimulated for 7 days to study the response of slowly proliferating capillary endothelial cells.
J R, Fike, E L, Gillette, F M, Edwards, J J, Kraushaar, D E, Prull   +4 more
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Pulsed thermal neutron source at the fast neutron generator

Applied Radiation and Isotopes, 2009
A small pulsed thermal neutron source has been designed based on results of the MCNP simulations of the thermalization of 14 MeV neutrons in a cluster-moderator which consists of small moderating cells decoupled by an absorber. Optimum dimensions of the single cell and of the whole cluster have been selected, considering the thermal neutron intensity ...
Grzegorz, Tracz, Krzysztof, Drozdowicz, Barbara, Gabańska, Ewa, Krynicka   +3 more
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Complications of Fast Neutron Therapy

1998
The purpose of the study was to identify the tissues and organs at risk following high-energy neutron-beam therapy for selected radioresistant tumors, estimating the separate probabilities of both normal tissue injury and of tumor recurrence, each in relation to the absorbed dose.
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Dosimetry techniques for fast neutrons

International Journal of Radiation Oncology*Biology*Physics, 1977
Abstract The instruments most commonly used for the dosimetry of mixed beams of neutrons and photons are classified in Table 1. The most common technique is to use a TE chamber to measure the total dose, from which the photon dose is subtracted by measurement with a neutron insensitive device. The TE calorimeter can provide a measurement of total dose
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Interaction of Fast Neutrons with Indium

Nature, 1948
INDIUM has two stable isotopes, In115 (95·5 per cent) and In113 (4·5 per cent). In115 can be excited by an (n,n) process to a metastable-level (In115*) at 340 keV. and returns to the ground-state by a strongly internally converted γ-transition with a half-life of 4½ hours1. Fast neutrons may also be captured in In115, leading to two isomeric activities
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