Postdoctoral Fellow; PREP

General Description

This position is part of the National Institute of Standards and Technology (NIST) Professional Research Experience (PREP) program. The PREP program supports research staff to collaborate with academic institutions on specific projects. Employees in this position will perform technical work that underpins the scientific research of the collaboration. U.S. Citizen Preferred.

Development of neutron generator-based prompt gamma activation analysis (PGAA) instrument

The incumbent will lead an effort to extend current reactor-dependent nuclear analytical techniques to those based on laboratory neutron sources, such as DD and DT neutron generators. PGAA is a non-destructive technique capable of multi-elemental analysis of materials, based on isotope-specific prompt gamma emission after thermal neutron capture. The project will adapt reactor-based expertise for neutron generator-based counterparts, addressing lower neutron intensity by optimizing moderators, shielding, geometry, and exploiting pulse coincidence detection for background reduction.

• Design and implement a neutron moderator for the neutron generator to produce a thermal neutron irradiation sample position.
• Establish neutron and gamma ray detection systems including detectors and electronics for PGAA measurements for elemental analysis in semiconductor materials.
• Perform PGAA spectral analysis.
• Investigate coincidence detection scheme to enhance detection limits.
• Publish findings in peer‑reviewed scientific journals and present at relevant meetings and conferences.

• PhD in Nuclear Engineering or a related field.
• Proficiency in radiation detection principles based on neutron and gamma ray interaction with materials.
• Experience with radiation transport simulations and hands‑on ability in designing and assembling neutron moderators for optimal thermal output.
• Expertise in nuclear digital and analog electronics related to operation of high purity germanium detectors and gamma ray spectrometry.

We are an equal‑opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, or any other protected status.