HSN-3000 Nuclear Event Detector

Maxwell Technologies’ HSN-3000 radiation-hardened Hybrid Nuclear Event Detector (NED) senses ionizing radiation pulses generated by a nuclear event, such as the detonation of a nuclear weapon, and rapidly switches its outputs from the normal high state to a low state with a propagation delay time of less than 20ns. The active low Nuclear Event Detection signal (NED) is used to initiate a wide variety of circumvention functions, thus preventing upset and burnout of electronic components.

The HSN-3000 is guaranteed to operate through three critical environments: ionizing dose rate [10(12) rad(Si)/s], gamma total dose [10(6) rad(Si)], and neutron fluence [5 x 10(13) n/cm2]. In addition, the device is designed to function throughout the transient neutron pulse. The hybrid’s discrete design ensures a controlled response in these radiation environments as well as immunity to latchup.

Each HSN-3000’s detection level and functionality are tested in an ionizing dose rate environment. A certificate is provided with each serialized hybrid, reporting the radiation test results and guaranteeing its performance. The device is also lot qualified in the total dose and neutron environments to ensure performance.

The detection threshold of the HSN-3000 is adjustable within the range of 2 x 10(5) rad(Si)/s to 2 x 10(7) rad(Si)/s. This detection level can be preset by Maxwell or adjusted by the user. Less than a 30% variation in detection threshold can be expected over the entire operating temperature range.