Abstract: A Compton camera includes a scattering detection unit, an absorption detection unit, a signal processing unit, a first shield unit, and a second shield unit. The scattering detection unit detects Compton scattering of incident radiation emitted from a radiation source. The absorption detection unit detects absorption of incident radiation that has undergone Compton scattering at the scattering detection unit. The signal processing unit obtains an image of the radiation source based on coincident detection events of Compton scattering of radiation at the scattering detection unit and absorption of radiation at the absorption detection unit. The first and second shield units are provided between the scattering detection unit and the absorption detection unit. The first shield unit selectively allows forward-scattered radiation to pass and selectively blocks back-scattered radiation.

Abstract: A Compton camera includes a scattering detection unit, an absorption detection unit, a signal processing unit, a first shield unit, and a second shield unit. The scattering detection unit detects Compton scattering of incident radiation emitted from a radiation source. The absorption detection unit detects absorption of incident radiation that has undergone Compton scattering at the scattering detection unit. The signal processing unit obtains an image of the radiation source based on coincident detection events of Compton scattering of radiation at the scattering detection unit and absorption of radiation at the absorption detection unit. The first and second shield units are provided between the scattering detection unit and the absorption detection unit. The first shield unit selectively allows forward-scattered radiation to pass and selectively blocks back-scattered radiation.

Abstract: This photodiode array 10 includes quenching resistors 7 which are connected in series to respective avalanche photodiodes APDs, a peripheral wiring WL which surrounds a region in which the plurality of avalanche photodiodes APDs are formed, and a plurality of relay wirings 8 which are electrically connected to the peripheral wiring WL, so as to respectively connect at least two places of the peripheral wiring WL. One of an anode and a cathode of each avalanche photodiode APD is electrically connected to any one of the relay wirings 8 via the quenching resistor 7, and the other of the anode and the cathode of each avalanche photodiode APD is electrically connected to another electrode 6 provided on a semiconductor substrate.

Abstract: This photodiode array 10 includes quenching resistors 7 which are connected in series to respective avalanche photodiodes APDs, a peripheral wiring WL which surrounds a region in which the plurality of avalanche photodiodes APDs are formed, and a plurality of relay wirings 8 which are electrically connected to the peripheral wiring WL, so as to respectively connect at least two places of the peripheral wiring WL. One of an anode and a cathode of each avalanche photodiode APD is electrically connected to any one of the relay wirings 8 via the quenching resistor 7, and the other of the anode and the cathode of each avalanche photodiode APD is electrically connected to another electrode 6 provided on a semiconductor substrate.

Abstract: The present invention relates to a high-speed particle generating method and so on for generating high-speed particles from a high-speed particle generating target by condensing a pulsed laser beam to a micro-spot on the surface of a high-speed particle generating target. The high-speed particle generating method is a method that generates high-speed particles by condensing a pulsed laser beam generated from a pulsed laser beam generator through an irradiation optical system at a predetermined condensing point, and irradiating the pulsed laser beam to the high-speed particle generating target that is set at the predetermined condensing point, the method including a first step of preparing a reference data, a second step of measuring the wave front of the pulsed laser beam, and a third step of compensating the wave front of the pulsed laser beam based on the reference data.

Abstract: The present invention relates to a deuteron generating target having a construction for generating deuteron efficiently, and a deuteron generating target apparatus including the same. The deuteron generating target is constructed by providing an upper film mainly composed of a deuterated organic compound onto a base film mainly composed of a halogen-containing organic compound.

Abstract: The present invention relates to a high-speed particle generating method and so on for generating high-speed particles from a high-speed particle generating target by condensing a pulsed laser beam to a micro-spot on the surface of a high-speed particle generating target. The high-speed particle generating method is a method that generates high-speed particles by condensing a pulsed laser beam generated from a pulsed laser beam generator through an irradiation optical system at a predetermined condensing point, and irradiating the pulsed laser beam to the high-speed particle generating target that is set at the predetermined condensing point, the method including a first step of preparing a reference data, a second step of measuring the wave front of the pulsed laser beam, and a third step of compensating the wave front of the pulsed laser beam based on the reference data.

Abstract: The present invention relates to a method and apparatus for efficiently measuring the lifetime of the fluorescence emitted from a fluorescent material in response to pulsed light. The measuring apparatus according to the present invention includes, at least, an excitation light source whose excitation power is regulated such that at least one fluorescence photon can be detected per light pulse on average. While repeatedly irradiating a sample containing the fluorescent material with excitation pulses of light from the excitation light source, a fluorescence detection time from irradiation to fluorescence detection and the number of detected fluorescence photons are measured for each excitation pulse of light.

Abstract: An electron-microscope image viewing apparatus capable of measuring of a moving speed or a vibration frequency of an atomic structure, a magnetic structure, an electric structure or the like of a specimen even when the structure changes at a high rate.

Abstract: When incident light is incident to a photodetector, photoelectrons are emitted therefrom and then multiplied to output an electric current signal. This current signal is integrated over a predetermined period of time in an integrator to be converted to a voltage signal. This voltage signal is converted to a digital signal by an AD converter. This digital signal is supplied to a histogramming memory, which generates a pulse height distribution of voltage signal. Based on a pulse height distribution N(h) generated with incidence of measurement-object light to the photodetector, a pulse height distribution of single photoelectron events p.sub.1 (h) generated by a generator of pulse height distribution of single photoelectron events, and pulse height distributions of k-photoelectron events p.sub.k (h) (k=2, 3, . . .

Abstract: When incident light is incident to a photodetector, photoelectrons are emitted and multiplied in each of incident zones whereby a plurality of current signals are output. These current signals each are processed to estimate a distribution or a mean value of numbers of photoelectrons generated in each incident zone. Then estimated based on the estimate values of respective incident zones is the number of photoelectrons emitted from the entire photoelectric conversion surface. In this way the intensity of incident light is measured with accuracy.

Abstract: A radiation imaging apparatus comprising scintillators for converting radiation from a sample into scintillation light, image intensifiers for amplifying the scintillation light and forming an amplified image of the radiation, the image guides for directing the scintillation light to the respective image intensifiers. The observing field of a sample is conceptually partitioned into plural sections with each section corresponding to a respective one of the image intensifiers. One end of each image guide faces a respective section of the sample and the other end of each image guide is connected to a respective image intensifier.

Abstract: The X-ray image microscope according to this invention comprises an X-ray absorption imaging unit having a glazing incidence mirror, and an electron imaging unit having an electron lens connected to the X-ray absorption imaging unit. A thin support film is provided on the boundary between the X-ray absorption imaging unit and the electron imaging unit. On the support film is formed a photocathode screen which emits photoelectrons in response to an incident X-ray. The X-ray absorption image of an X-ray which has penetrated a specimen, e.g. a living cell, is magnified by the X-ray imaging unit, and the electron image corresponding to the X-ray image is magnified by an electron lens. The magnified electron image is converted into a light image by a phosphor screen, and the light image is caught by a TV camera. In this way biological materials can be observed, magnified in their living states.