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A modular, high dynamic range passive neutron dosimeter and imaging diagnostic.

T R Schmidt¹, R H Dwyer^1,2, D P Broughton¹

¹Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA.

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|July 15, 2024

Summary

The multi-decade neutron dosimeter and imaging diagnostic (MDND) offers enhanced sensitivity for neutron measurements using polyethylene. Simulations optimized its design for a wide dynamic range in neutron fluence and source yield.

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Area of Science:

Nuclear physics and instrumentation
Neutron detection and measurement

Background:

Passive neutron diagnostics are crucial for time and energy integrated measurements.
Existing methods require enhancement for broader dynamic range and sensitivity.

Purpose of the Study:

To design and simulate a multi-decade neutron dosimeter and imaging diagnostic (MDND).
To optimize the MDND for enhanced sensitivity and a wide dynamic range in neutron measurements.

Main Methods:

Utilized the polyethylene (n, p) nuclear reaction for neutron detection.
Employed Monte Carlo N-Particle (MCNP) transport code for diagnostic design and simulation.
Combined radiochromic film, phosphor image plates, and solid-state nuclear track detectors.

Main Results:

Optimized polyethylene converter thickness for maximum proton fluence.
Determined a dynamic range of 10^7 to 10^15 neutrons emitted into 4π for the MDND.
Analyzed detector response as a function of neutron energy and yield.

Conclusions:

The MDND design, guided by MCNP simulations, provides a significant dynamic range for neutron measurements.
The diagnostic is suitable for time and energy integrated neutron fluence measurements from 2.45-14.1 MeV.
This work presents a validated design for advanced neutron diagnostics.