Radiological Safety Expert - Red Team

Mercor; Toronto; On-site; CAD 110,000 - 190,000; Full time

Job summary

Mercor is assembling a panel of radiological safety experts to red-team frontier AI models. You will craft prompts at three levels—benign, dual-use, and adversarial—and judge model responses against a defined policy standard.

You will also write the reference answer with a clear rationale, ensuring non-specialists can follow the reasoning. Strong technical writing and sustained focus on misuse scenarios are essential.

Qualifications

• Background in radiological emergency planning at licensed facilities or national levels.
• Proven ability to craft clear rationales for non-specialists.
• Experience in red-teaming frontier AI or similar security testing.
• Strong writing and analytical skills with demonstrated technical writing.

Responsibilities

• Write challenging single-turn prompts in benign, dual-use, and adversarial categories.
• Evaluate model responses against a defined policy standard.
• Write the reference answer with the technical rationale.
• Read and write about misuse scenarios in radiological domains.

Skills

Red-teaming

Technical writing

Radiological emergency planning

Model misuse evaluation

Written rationale for non-specialists

Job description

About the work

Mercor is assembling a panel of radiological safety experts to red-team frontier AI models. The goal is to test whether a model can correctly judge the misuse potential of a technical request — answering legitimate questions fully while refusing genuinely dangerous ones.

You will:

• Write challenging single-turn prompts in your domain, labelled across three levels: benign, dual-use, and adversarial.
• Evaluate the responses that come back against a defined policy standard, and judge whether each was handled correctly.
• Write the reference answer — what a correct response looks like, and the technical reasoning for why.

This domain lives on the dual-use line more than most. The same isotope underpins cancer therapy and industrial radiography; the same shielding calculation protects a worker and conceals a source. A model that refuses a routine dose question is failing as badly as one that answers a question it shouldn't. Drawing that line reliably is why we need practitioners rather than generalists.

Background we're looking for

We're looking for people who have planned for or responded to a radiological event — the consequence, contamination and protective-action side, held as a real responsibility rather than a tabletop interest. What matters most is being able to tell a routine professional question from one that’s fishing for something else: the same dispersal model that drives an evacuation decision also describes an effect someone might want. You will be writing prompts that sit exactly on that line, then judging whether the model held it.

Examples of relevant backgrounds (ideally with red-teaming experience):

• Radiological emergency planning at a licensed facility, or at state or national level — plans, drills, exercises
• Field response and monitoring — FRMAC, RAP, CBRN or national radiological response teams
• Consequence and dispersal modelling — plume and deposition estimates, dose projection, protective action decisions
• Incident command or response coordination for a radiological event or full-scale exercise
• Medical and public-health radiological response — triage, countermeasures, population monitoring

What this role demands beyond technical depth

This is writing-intensive work. Every judgment you make needs a written rationale that a non-specialist can follow. Prior technical writing, published research, or expert witness experience is a strong signal; please include a sample or link. You will also be reading and writing about misuse scenarios in your field for sustained periods. We brief experts on this in advance, and you can pause or step away at any point without penalty.

Before you apply

Your work here will not involve, and must not draw on, classified or export-controlled information, or anything covered by an NDA or prepublication review obligation. If you hold such obligations you may still be a good fit; tell us in your application and we will scope the work accordingly.