Abstract: A radiation deep dose measuring apparatus. A corpuscular beam detector of scintillation fibers bundled together into a block is adjusted in position to have a width similar to the radiation range of corpuscular beams; a driving apparatus rotates the corpuscular beam detector and an image receiver together around a center corresponding to a radial axis of the beams; the image receiver captures the image of scintillation light emanating from the corpuscular beam detector; an image signal processing apparatus processes the image signal to produce the distribution of radiation doses as a function of depth; and a displaying apparatus displays the result. The radiation deep dose measuring apparatus allows rapid measurement of radiation doses in three-dimensional space.

Abstract: A wide range radiation detector which can precisely detect high energy region radiations. The detector has a plurality of layered semiconductor elements wired in parallel, and outputs the energy of the radiation by summing the charges generated by ionization of the radiation incident on the semiconductor elements.

Abstract: In a depth dose measuring device, a light is outputted from an end surface of a block-type detector (202) formed by tying a plurality of scintillation fibers in a bundle, a spectroscope (204) is used to disperse the light so as to measure an amount of light having a wavelength corresponding to an emission spectrum of the scintillation fibers, a picture measuring device (205) and a picture processing device (206) calculate an emission distribution of only a scintillation light depending upon an emission distribution in which the scintillation light and a Cerenkov light are mixed, and a result is displayed on a display device (207).

Abstract: In a depth dose measuring apparatus, a fluorescent substance block (1) bundling scintillation fibers of which radiation absorption characteristic is close to that of tissue, is disposed orthogonally to the incident direction of radiation (4-1). The fluorescence intensity distribution on the fiber end faces of the fluorescent substance block (1) is measured by an image measuring device (6). Therefore, the two-dimensional fluorescence intensity distribution in the incident direction of radiation and in another orthogonal direction, that is, the absorption dose distribution can be measured simultaneously by one irradiation. Moreover, if the fluorescent substance block (1) is composed by laminating plate-form scintillators, one-dimensional absorption dose distribution in the depth direction can be measured by one operation.

Abstract: A radiation detecting section including scintillation fibers is arranged in a one-dimensional, two-dimensional or three-dimensional manner. A multichannel amplitude analyzer can obtain an incident position of radiation in the radiation detecting section, and a radiation dose rate at the incident position depending upon a signal having amplitude according to a difference in arrival time between two input signals. A microcomputer carries out inverse problem analysis to estimate a radiation source distribution or a spatial radiation intensity distribution.

Abstract: A neutron particle measuring apparatus includes a neutron converter to generate alpha rays in response to incidence of neutron, a scintillator to receive as input the alpha rays generated from the neutron converter so as to emit and transmit scintillation, two photoreceptive portions to receive the scintillation through different transmitting paths, and a signal processing portion to measure a neutron distribution depending upon times at which the scintillation can reach the photoreceptive portions according to a time-of-flight method. The single particle measuring apparatus can be used to measure the neutron distribution in the vicinity of a nuclear reactor in a nuclear power plant.

Abstract: A distribution type detector comprises scintillation fibers identical in length to each other, an optical delay fiber having a refractive index substantially identical to those of cores and claddings of the scintillation fibers, photosensitive elements, preamplifiers, constant fraction discriminators, a time-to-pulse height converter, an analog-to-digital converter, and a multichannel pulse-height analyzer. A position where a radiation falls on its corresponding scintillation fiber, is detected based on a difference between time intervals necessary for propagation of optical pulses produced in the corresponding scintillation fiber by the radiation. Thus, even if the length of each scintillation fiber is increased, position resolution can be kept high and a measuring circuit system can be simplified.

Abstract: A vacuum pipe for use in a synchrotron orbit radiation device includes a vacuum pipe body made of a thin non-magnetic material surrounding a charged particle beam propagating on an annular path, a port portion cell interposed in the vacuum pipe body surrounding part of the path, and a port mounted on the port wall tangential to the path for introducing radiation. The vacuum pipe body has a smooth inner wall surface and reinforcing ribs on an outer wall surface. A wall of the port portion cell located on an outer diameter side of the path is oblique to the wall of the port portion cell on the inner diameter side.

Abstract: A levitator which is mounted on a space station; for example, for use in material science experiments in space. The levitator has a position detector for detecting the position of a sample, a variable power supply whose output voltage varies in accordance with the signal output from the position detector, a pair of planar electrodes connected to two ends, respectively, of the variable power supply and disposed in opposing relation to each other, and a ring electrode disposed so as to surround each of the planar electrodes and to which is applied a higher voltage than that applied to the corresponding planar electrode from a DC power supply, thereby holding the sample stationary at a desired position by means of the planar and ring electrodes. The levitator further has a means for rotating the sample being held stationary. Thus, it is possible to rotate the sample in a controlled manner and hence possible to carry out an experiment in which the sample is uniformly heated in a microgravity environment.

Abstract: An accelerator vacuum pipe for a charged-particle acceleration and storage system having a vacuum zone defined therein is provided with a layer of getter material which can capture residual or generated gas molecules in the pipe-member. The layer of getter material is disposed over the entire inner wall of the vacuum pipe in at least a deflection zone where the charged-particles are deflected.

Abstract: The in-line type electron gun of this invention is formed so that a depression, which is formed at the lower voltage electrode face opposing to the higher electrode of the two electrodes for forming a common main focusing lens in the opposing gap thereof and has three lens holes for individual electron beams arrayed in-line at the bottom thereof, is formed so that the width in the direction perpendicular to the lens hole array direction is smaller at the central part in the lens hole array direction as compared with the other parts. Also the center lens hole of the three lens holes at the bottom of the depression is smaller in diameter than the other two. Accordingly, the focus voltages of the three beams passing through the three lens holes and the shapes of beam spots are made more uniform as compared with the prior art.

Abstract: An automatic impact driver for applying a large torque to a tip chuck by only pressing down a casing so as to remove corroded screws etc. A cylindrical slider freely movable in an axial direction is disposed in the casing, a cam mechanism is installed in between the slider and the chuck, and the chuck is turned by applying an impact force on a plunger through the slider. Since the impact driver is constructed as described above, a loss of impact transmitting force is decreased as compared with a conventional structure in which the slider is directly struck by the casing.

Abstract: A cathode ray tube apparatus comprises three cathodes arranged in line with each other in a first direction for emission of respective electron beams therefrom, a focusing electrode having first to third apertures defined therein for the passage of the respective electron beams therethrough, a quadrupole electrode structure including first to third quadrupole electrodes one for each electron beam, each of the quadrupole electrode being comprised of a pair of horizontal electrode pieces spaced a predetermined distance from each other in a second direction perpendicular to the first direction and positioned upwardly and downwardly, respectively, with respect to the associated electron beam, and a pair of vertical electrode pieces spaced a predetermined distance from each other in a direction aligned with the first direction and positioned leftwards and rightwards with respect to such associated electron beam, and a power source circuit for applying a predetermined voltage to the quadrupole electrode structure.

Abstract: A synchrotron comprises a tubular vacuum chamber forming a closed orbit, charged particles moving around therein; less than four bipolar magnets installed along said vacuum chamber and used to deflect said charged particles; and means for easing the converging action to said charged particles in the horizontal direction due to said bipolar magnets.

Abstract: A charged particle accelerating apparatus has a vacuum chamber for transporting, accelerating, deflecting or storing charged particles. A layer of a low gas-generating material is placed in the vacuum chamber at a position where radiation generated by deflection of the charged particles are irradiated, the low gas-generating material having properties of generating an amount of gas less than a material constituting the vacuum chamber.