Speaker
Dr
Ezio Previtali
(Istituto Nazionale di Fisica Nucleare, Sez. Milano Bicocca, Italy)
Description
In high sensitive experiments for rare events physics searches, the determination of contaminants is one of the most critical issue. Radioactive contamination in constructing materials can mimic the tiny signal of the studied events and this reduces the global experimental sensitivities. To fulfill the requests of experiments like double beta decay or dark matter searches, sensitivities in the scale of microBq/kg for 238U and 232Th chains are actually needed: such measurement capabilities are normally not accessible from standard instrumentations.
Many spectroscopic techniques were developed in order to reach the requested sensitivities and to guaranty the correct selection of the detectors materials. In this way also the construction of the spectrometers need particular cares and specific approaches.
Actually HPGe spectrometers specifically constructed reach very high capabilities in the detection of very low radioactive background in ultra pure materials. These detectors were realized using the same approach as that adopted for low background experiments that give us the methodological approach to increase their measurement sensitivities.
Methods, instrumentations and specific data analysis developed for very high sensitive measurements will be presented. Applications of these high sensitivities techniques to other field of scientific researchers will be also discussed.
Author
Dr
Ezio Previtali
(Istituto Nazionale di Fisica Nucleare, Sez. Milano Bicocca, Italy)
