How it works
BTI’s passive bubble detectors turn neutron interactions in superheated droplets into visible bubbles retained in a gel. The bubble count provides a direct dose indication without powered electronics. BD-PND addresses personal fast-neutron dosimetry; BDT provides a thermal-neutron option; BDS combines detectors with different thresholds for neutron-energy spectral unfolding. These are related sensing products with different measurement purposes.
CSA documents historical BTI bubble-detector use aboard the ISS through Radi-N2, where crew deployed and later read detectors. That flight heritage supports the detector family’s experience in space; it does not establish qualification or deployment of the newer active CANS instrument.