RADIATION MONITORING DEVICES, INC. — Department of Homeland Security SBIR Phase I: H-SB015.1-009

Description

We propose to develop a thermal neutron detection module based on LiInSe2 semiconductor material as an alternative to He-3 detectors. While recent depletion of He-3 gas is the main driving force behind development of He-3 replacements, other issues with He-3 tubes such as a pressurized vessel used and microphonic issues are also important factors in handheld and portable detectors. LiInSe2 offers (1) efficient thermal neutron detection (significantly higher per-volume than 3H); (2) direct conversion of the neutrons to electrical signal, which is an advantage compared to the alternative solution based on scintillators with neutron detection capabilities; and (3) good separation between gamma and neutron particles utilizing simple pulse height discrimination. The final goal is to develop a LiInSe2 detection module and integrate it into a compact handheld instrument. The goals of Phase I are to advance the synthesis and crystal growth of high quality semiconductor material, and develop a prove-of-principle prototype module. In Phase II the final version of the detection module will be developed and integrated into a neutron handheld instrument.