Apparatus for detecting position of radiation source

A system for determining the location of a radiation source, comprising:

• a collimator unit through which radiation selectively passes depending on its incident direction;
• a scintillator unit converting the incident radiation from the collimator unit into light;
• a first optical sensor converting the incident light from one end of the scintillator unit into a first optical signal;
• a second optical sensor converting the incident light from the other end of the scintillator unit into a second optical signal;
• and
• a location information acquisition unit acquiring information on where the light is generated in the scintillator unit based on the first and second optical signals,
• wherein the scintillator unit comprises:
• a light guide arranged between the first and second optical sensors and having a plurality of insertion holes spaced apart from each other on an outer surface thereof;
• and
• a plurality of scintillators, and
• wherein each of the plurality of scintillators is inserted into a corresponding insertion hole such that an upper surface of each of the plurality of scintillators is disposed inside the corresponding insertion hole and below the outer surface of the light guide.