42 results about "Low dose rate" patented technology

A low-dose-rate (LDR) brachytherapy device having a spatiotemporal radiation profile includes an elongated body having a radioactive material in a spatial pattern to provide a spatial radiation profile with a radiation intensity that varies along a length of the elongated body. The radioactive material includes at least first and second radioisotopes having at least first and second respective decay profiles that together provide a temporal radiation profile that is different from the first and second decay profiles. The spatial radiation profile and the temporal radiation profile form a net spatiotemporal radiation profile configured to provide a radiotherapy plan for a patient.

In an exemplary process for lower dose rate ion implantation of a work piece, an ion beam may be generated using an ion source and an extraction manipulator. The extraction manipulator may be positioned at a gap distance from an exit aperture of the ion source. A current of the ion beam exiting the extraction manipulator may be maximized when the extraction manipulator is positioned at an optimal gap distance from the exit aperture. The gap distance at which the extraction manipulator is positioned from the exit aperture may differ from the optimal gap distance by at least 10 percent. A first potential may be applied to a first set of electrodes. An x-dimension of the ion beam may increase as the ion beam passes through the first set of electrodes. The work piece may be positioned in the ion beam to implant ions into the work piece.

The invention discloses a composite oil phase for preparing bulk emulsified explosives with upward hole charges. The composite oil phase consists of white oil, naphthenic oil, polymer ester emulsifier, crosslinking agent, S-80 , anti-turbulence agent, and prepared by the following method: first heat white oil, naphthenic oil, polymer ester emulsifier, and S-80 in separate melting tanks to 60-70°C, and then mix according to the ratio requirements The oil pump is measured by the electronic scale and then pumped into the reaction kettle one by one. After stirring and heating up to 80-90°C, add the measured cross-linking agent and anti-turbulence agent, and continue stirring for about 30 minutes until the cross-linking agent and anti-turbulence agent are fully After melting, the finished product is obtained after filtering. The bulk emulsion explosive produced by the composite oil phase of the present invention has the remarkable characteristics of good explosive performance, high working capacity, long storage period, anti-turbulence, long-distance transportation, small colloidal viscosity gradient coefficient, and easy pumping at room temperature. When used in underground mines to charge holes, the rate of drug return is extremely low. It can replace imported products to produce high-quality bulk emulsion explosives, and has good economic benefits.