Abstract: A collimator, a radiological imaging apparatus and a nuclear medicine diagnosis apparatus which are able to improve the sensitivity are provided. The radiological imaging apparatus has a collimator 11 disposed to oppose a radiological detection device 12 and having through-holes 11a for passing to the radiological detection device 12 gamma rays in a specified direction out of those radiated from an object to be examined. The collimator 11 is produced by mutually coupling a plurality of metal tubular members 11A each having the through-hole 11a with the help of a bonding agent S in alignment with a plurality of detectors 12a constituting the radiological detection device 12.

Abstract: A heat sink has a heat pipe inside of which a working fluid is filled and which is extended by a predetermined length from a heat source in a heat radiation direction, and a radiation fin having a mountain portion and a valley portion formed in a longitudinal direction of the heat pipe, the mountain portion and the valley portion forming a continuous waveform. The radiation fin further has a step portion for fitting and retaining the heat pipe thereinto.