<p>PURPOSE: An apparatus for inspecting the uptake of a radioactivity isotope is provided to improve a reliability of an inspection by reducing a noise of a radiation source through a dose attenuating filter. CONSTITUTION: A gamma-ray is indented inside a sight(23). A scintillator(22) is arranged inside the sight. The scintillator changes a gamma rays energy which is income inside the sight into a light. A photomultiplier(21) is inserted in the back-end of the sight. The photomultiplier changes the light transformed by the scintillator into an electric signal. A dose attenuating filter(24) is detachably arranged on the front-end of the sight. The dose attenuating filter attenuates the gamma-ray which is irradiated into the sight.</p>
