A kind of ultralow background multi-photon detector device radioisotopic (20) has the material of background one attomole of about count detection daily. Each of two opposite γ and x-ray photon detector preferably include a scintillation crystal (22) and photomultiplier tube (26). It is clipped in the radioactive isotope of the separator (32) of detector and the sample of retainer (34) and (36) label, such as I125. For each detector from the radioisotopic pulse of electrical power for radiating and being converted into pedestal (30), these pulses are subjected to signal processing pulse form analysis, identify and are overlapped from asynchronous events, the radioactive isotope of quantization. To material for detector and component to minimize background, composite shield (55) are shielded with external radiation. Detector operation is in different principe and has sampled the different configurations of retainer and can be used. The device can be further configured to differentiate and provide the image of bidimensional sample array.
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