Patent ID: 8993973
Filing Date: 2015-03-31
Classification: G01T

Abstract:
1. A pixel-type two-dimensional image detector wherein in a lattice-like pixel structure in which a reflecting plate that reflects a fluorescent light from a fluorescent material-based heavy particle beam detecting sheet emitting a fluorescent light in response to an incident of a heavy particle beam is arranged along a vertical axis at a regular interval, and a reflecting plate that reflects a fluorescent light is arranged along a horizontal axis at a regular interval and at a right angle with respect to a series of fluorescent plates formed arranged along the vertical axis, a lattice-like fluorescent light detecting member is formed by providing such a structure that a groove may be formed at upper half position or lower half position of the reflecting plate arranged in a vertical axis direction and at a center position in a vertical axis interval for accommodating a single wavelength shifting fiber for vertical axis detection for detecting the fluorescent light, and providing such a structure that a groove may be formed at upper half position or lower half position of the reflecting plate arranged in a horizontal axis direction and at a center position in a horizontal axis interval for accommodating a single wavelength shifting fiber for horizontal axis detection for detecting the fluorescent, and said fluorescent material-based particle beam detecting sheet for emitting the fluorescent light in response to an incident of the heavy particle beam is arranged only at a front surface or at both of a front surface and a back surface of the lattice-like fluorescent light detecting member, wherein a fluorescent light with its wavelength converted by and emitted from the wavelength shifting fiber for vertical axis detection and the wavelength shifting fiber for horizontal axis detection is detected respectively by a photodetector to obtain a vertical axis pulse signal and a horizontal axis pulse signal; and an incident position of the heavy particle beam is determined by applying a coincidence count measurement to the vertical axis pulse signal and the horizontal axis pulse signal.