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DOE OSTI · 1887128

Modeling and Simulation of MC-Small Design

Harvis, Alek Keenan·Nelson, Mark Andrew·Hutchinson, Jesson D.·Romero, Christopher Daniel·Sorensen, Eric Byron
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Abstract

In order to design a lightweight, highly portable neutron multiplicity counter for use in higher risk regions by mobile field teams, a redesign of the MC-15 is being performed, with the goal of producing a detector below 30 lbs for ease of transport. To achieve this, multiple MCNP® simulations were run, evaluating the number and positioning of the He-3 tubes in the detector as well as the amount of high-density polyethylene (HDPE) surrounding the tubes. Based on these simulations, the proposed redesign of the MC-15 (aka MC-Small) possesses 11 tubes and is 13 in wide, 3.21 in thick and 13 in tall. Including the changes to the positioning of the tubes and the removal of HDPE from less sensitive regions of the detectors (i.e. bases of tubes, back of detector), this resulted in an efficiency of 0.56% when measuring a bare Cf-252 source 19.69 in away, only 28% less efficient (relatively) than the MC-15 while weighing 18 lbs, 12 lbs less than the weight of the MC-15.

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42 ENGINEERING73 NUCLEAR PHYSICS AND RADIATION PHYSICS97 MATHEMATICS AND COMPUTING

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Harvis, Alek Keenan, Nelson, Mark Andrew, Hutchinson, Jesson D., Romero, Christopher Daniel, Sorensen, Eric Byron. 2022-08-01. Modeling and Simulation of MC-Small Design. https://doi.org/10.2172/1887128

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