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OpenTrainMaster's

Radioactive Materials and Health Physics Expert (AI Safety)

You will create and review evaluation content that tests whether AI model responses about radioactive materials and health physics are safe, unsafe, or in need of caution. The work combines specialist judgment, written analysis, and review of AI evaluation tasks.

Field
Physics
Where
United States, Australia, Canada, New Zealand, United Kingdom
Asks for
Master's
Posted
3 days ago

Pay data for your profession: Science AI trainer jobs · Physics AI trainer jobs

How this pay compares

At $150/hr, this role pays more than 84% of the 43 open physics roles with a listed pay range, above the median of $75.

Open physics roles that ask for a Master's have a median of $68/hr (14 roles).

Among platforms with 10 or more priced physics roles, OpenTrain AI has the highest median ($95/hr across 20 roles) and Alignerr the lowest ($45/hr across 11).

OpenTrain AI roles that closed since late October stayed listed a median of 31 days (122 roles). OpenTrain AI posted this one 3 days ago.

Computed from 2,746 open roles we track across Mercor, micro1, Handshake AI, Alignerr, Appen and OpenTrain AI, refreshed daily. Midpoints of listed ranges; “up to” ceilings are left out of medians.

What you would earn at this rate

Rate

$150/hr

Per week, before tax

$2,250

Per month, if the work is steady

$9,750

Tax
Contract pay arrives with no tax withheld. A US contractor at this rate and these hours would set aside about $2,465 a month for self-employment tax plus federal income tax at the 12% bracket (25%, before state tax). Outside the US, your own country's rules apply.

Assumes paid hours only; unpaid assessments, onboarding and gaps between projects lower the real figure. Full take-home calculator · Track what you actually earn

Open physics roles on each platform

The same kind of work, priced on every platform we track, with the best-paid open role on each.

PlatformOpenMedianBest-paid open role
micro16$150/hrPrincipal Research Scientist (Computer Science / Computational Physics)$100-400/hr
OpenTrain AIthis role20$95/hrPrincipal Research Scientist: CS / Computational Physics$100-400/hr
Mercor6$78/hrPhysics Domain Expert$90-140/hr
Alignerr11$45/hrPhysicist, PhD$90-120/hr
Handshake AI6up to $63/hrPhysics ExpertUp to $125/hr

“Up to” rows list only ceilings, so their median is a maximum, not comparable with the range midpoints above them.

All 49 open physics roles →

The full listing

As posted on OpenTrain AI. See the original

The work

You will create and review evaluation content that tests whether AI model responses about radioactive materials and health physics are safe, unsafe, or in need of caution. The work combines specialist judgment, written analysis, and review of AI evaluation tasks.

  • Write prompts and scenarios that test the boundary between safe and unsafe requests.
  • Classify prompts created by other experts as safe or unsafe.
  • Explain the technical safety reasoning behind each decision.
  • Revise evaluation content using structured reviewer feedback.

What it pays and takes

This is remote, flexible, task-based work for a specialist in a safety-critical technical field. Prior experience with AI evaluation, red teaming, or data annotation is useful but not required.

  • Pay: $150 per hour.
  • Location: Open to candidates in Australia, Canada, New Zealand, the United Kingdom, and the United States.
  • Language: Professional fluency in English.
  • Education: A master's degree or higher in health physics, radiochemistry, nuclear engineering, or a closely related field.
  • Required ability: Explain technical safety reasoning clearly and precisely.
  • Helpful experience: Work as a radiation safety officer, health physicist, or radiochemist; experience managing radioactive sources or waste.

How it works

Apply on OpenTrain with your resume, then complete the application on the hiring site.

About AI training work

AI training is the human work behind systems that learn from examples. Experts write, review, and rate model responses so AI systems can handle specialized topics more safely and accurately.

From applying to your first payment on OpenTrain AI

  1. 1

    Create a profile

    Create a free OpenTrain profile with your domains, languages and hourly rate.

  2. 2

    Apply

    Apply to the listing. Some listings hire through OpenTrain; others send you to the hiring platform.

  3. 3

    Funded milestones

    The client funds each milestone before work starts.

  4. 4

    First payment

    OpenTrain pays out to your connected payout method when the client approves the milestone. It doesn't publish a fixed payout schedule.

Sources: OpenTrain: AI training careers, OpenTrain docs: invoicing and payouts

Full OpenTrain AI profile: watch-outs and the public record →

Pay history

OpenTrain AI has listed this role at $150/hr since Nov 10, 2026 with no change.

Across OpenTrain AI's physics roles, the median listed pay was $75/hr on Nov 1, 2026 (11 roles) and is $95/hr as of Nov 11, 2026 (20 roles).

What workers report about OpenTrain AI

Anonymous reports from people who applied or worked there: whether they got work, what they were paid and how fast.

Other physics roles

All 49 physics roles →