Fission chambers are designed primarily to measure neutron radiation through induced fissions, making them more sensitive to neutrons than gamma or beta radiation. To enhance neutron sensitivity, these detectors are often shielded with high atomic number materials that absorb beta particles and scatter gamma rays while allowing neutrons to pass through. The significant difference in neutron flux levels between full power and shutdown conditions complicates the design of fission chambers, necessitating the use of various detectors for different operational states. In high power scenarios, the signal-to-noise ratio is much larger, allowing for more accurate readings compared to the low neutron levels present in the source range. Overall, the fission chamber's design and operational principles prioritize neutron detection over other radiation types.
