Results 211 to 220 of about 18,856 (260)

Neutron spectrometry for radiation protection

Radiation Protection Dosimetry, 2004
The various instruments used for neutron spectrometry can be divided into four categories. Within each of these categories, the underlying measurement principle for all devices is essentially the same. The applications of the instruments within each group to spectrometry for radiation protection are reviewed.
openaire   +2 more sources

Microdosimetric Specification of Radiation Quality in Neutron Radiation Therapy

International Journal of Radiation Biology, 1990
The neutron beams used by various radiotherapy centres are of widely differing energies, and differences of up to 50 per cent in the relative biological effectiveness (RBE) between different beams have been found in radiobiological experiments. Moreover, at some facilities RBE variations have been observed with increasing depth in a phantom.
H G, Menzel, P, Pihet, A, Wambersie
openaire   +2 more sources

Scattered radiation from a neutron collimator

Medical Physics, 1977
Fast‐neutron beams are being employed in radiotherapy trials and associated radiobiology studies at numerous centers in the U.S., Europe, and Japan. Since collimated beams of various sizes and shapes are employed, it is desirable to know the composition of the scattered radiation component contributed by the collimator.
F H, Attix, L S, August, P, Shapiro
openaire   +2 more sources

A superconducting cyclotron for neutron radiation therapy

Medical Physics, 1994
The physical and clinical specifications of a neutron therapy facility utilizing a superconducting cyclotron are presented. The cyclotron and its support system are described. Details of the operation of the cyclotron in a hospital environment are given; the requirements of the helium liquifier and cryogenic system are described together with a summary
R L, Maughan, W E, Powers, H G, Blosser
openaire   +2 more sources

Response of Burros to Neutron-gamma-radiation

Health Physics, 1961
The response of burros to neutron- gamma -radiation was studied. Seven animals received 180 rads (145 rads n, 35 rads gamma ) at a rate of 6 rads per min. The death of two burros at this dose level was unexpected. The clinical symptoms of these animals resembled those of central nervous system damage, heretofore seen with larger doses and much higher ...
R E, THOMAS, D G, BROWN
openaire   +2 more sources

Solar Neutrons and the Earth's Radiation Belts

Science, 1964
The intensity and spectrum of solar neutrons in the vicinity of the earth are calculated on the assumption that the low-energy protons recently detected in balloon and satellite flights are products of solar neutron decay. The solar-neutron flux thus obtained exceeds the global average cosmic-ray neutron leakage above 10 Mev, indicating that it may be ...
R E, Lingenfelter, E J, Flamm
openaire   +2 more sources

Neutron Radiation Facility

Physics Today, 1963
A 70-inch cyclotron is now under construction at the US Naval Radiological Defense Laboratory at Hunters Point, Calif. Known as the Neutron Radiation Facility, the machine will be used mainly in neutron-damage studies, but proton and deuteron experiments will also be possible. Construction will cost $3 million.
openaire   +1 more source

Physics intercomparisons for neutron radiation therapy

International Journal of Radiation Oncology*Biology*Physics, 1977
Abstract For several years, a concerted effort has been going on to ensure that all the groups involved in neutron dosimetry have intercompared their absorbed dose standards. These intercomparisons have relevance to both neutron radiotherapy and neutron radiobiology.
P R, Almond, J B, Smathers
openaire   +2 more sources

Treatment planning for neutron radiation therapy

International Journal of Radiation Oncology*Biology*Physics, 1977
Abstract Treatment-planning techniques developed for photon therapy have been freely borrowed for fast-neutron beam therapy, including methods of storing the measured data and subsequent manipulation to correct for patient contour, inhomogeneities, oblique incidence of the beam, and the presence of beam-modifying devices.
P, Wootton, K, Weaver, J, Eenmaa
openaire   +2 more sources

Treatment of Malignant Gliomas with Neutron Radiation

Neurologic Clinics, 1985
The author contends that neutron radiation therapy coupled with radiation therapy or other forms of particle radiation therapy may play a role in the management of malignant gliomas. Improved survival, particularly for the patients with the diagnosis of glioblastoma, is discussed.
openaire   +2 more sources