National Institute of Radiological Sciences

Hidehito Nakamura

Disclosed is a radiation detection element which can inexpensively be manufactured. The detection element including, as a main component, a base resin not containing any fluorescent substance at all is used for radiation measurement.

Radiation detection element

A gamma ray detector for detecting a gamma ray emitted from a target of measurement includes: an organic scintillator for detecting Compton electrons resulting from a gamma ray emitted from the target of measurement; an inorganic scintillator for detecting a Compton gamma ray; and photodetector modules for detecting light generation in the corresponding scintillators. Light generation signals from the organic and inorganic scintillators are synchronously measured, and a detection window of a gamma ray is generated. Thus, an inexpensive radiation diagnostic device of an ultra-high S/N ratio and low cost is provided.

Gamma ray detector, radiation diagnostic device, tomography device, and method of analyzing tomography device

A beta ray detector and a beta ray reconstruction method are capable of achieving consistently high detection efficiency of beta rays in a wider energy region compared to that of a conventional beta ray detector while enhancing energy resolution. The beta ray detector comprises an absorber scintillator disposed to face a subject emitting beta rays and that is made from an absorptive substance exhibiting a high permeability and a high rate of absorption with respect to beta rays, a backscattering scintillator disposed on the backside of the absorber scintillator and that is made from a backscattering substance exhibiting a low permeability and a high rate of backscattering with respect to beta rays, and an energy detector that combines the amounts of beta ray energy absorption simultaneously measured by the two types of scintillators to reconstruct the energy and detection position of the beta rays emitted from the subject.

Beta ray detector and beta ray reconstruction method

Provided are a gamma ray detector and a gamma ray reconstruction method which can be used in SPECT and PET and which combine and reconstruct the information on 'Compton-scattered' gamma rays, thereby remarkably increasing gamma ray detection sensitivity, decreasing the amount of a radioactive substance given to a subject, and remarkably reducing the concern about the amount of radiation exposure. The gamma ray detector comprises an absorber scintillatormade from an absorptive substance exhibiting a high rate of absorption with respect to gamma raysin an energy region, emitted from a subject, a Compton scattering scintillatormade from a Compton scattering substance exhibiting a high probability of Compton scattering, and an energy detectorwhich combines the amounts of gamma ray energy absorption simultaneously measured by the two types of scintillators to reconstruct the gamma rays emitted from the subject. The two types of scintillatorsandare arranged in multiple layers so as to absorb or Compton-scatter the whole energy of the gamma rays

Gamma ray detector and gamma ray reconstruction method

When an energy of a particle emitted from a radioisotope source is obtained by a detector, a histogram obtained from a relationship between a difference &#x394;E between an energy of a particle emitted outside the radioisotope source and an initial energy which the particle possesses at the time of generation and a count is treated as being asymmetric, and an energy distribution (L) of the particle emitted outside the radioisotope source is obtained, thereby allowing an energy calibration of a radiation detector, absolute quantitation and resolution measurement to be performed with accuracy.

Method, device and program for estimating particle emitted from radioisotope source, method for estimating radiation detector, method and device for calibrating radiation detector, and radioisotope source

Growing community of inventors

Chiba, Japan

Hidehito Nakamura