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Radium

In the body: no agency opinion we hold names an effect at the amounts found in food, so it is shown for context, not rated.

Not rated by dose: a flag on one reviewed food, Brazil nuts, raw.

Background. Shown, not scored: no dose basis at normal intake, a classification rather than a risk, or legal limits only.

All hazards

The reference value and where it comes from

  • The agency’s figureno agency dose value
  • Basisno health-based intake limit exists for radium (radioactivity); the paper cites the general public dose limit of 1 mSv/year and adult effective dose coefficients 2.8e-7 Sv/Bq (226Ra) and 6.9e-7 Sv/Bq (228Ra)
  • Source Barkleit 2025

Reviewed foods that carry it

1 reviewed food carries it; none is rated by dose.

How often you can eat it

No food here is rated by dose. Each line says why it’s listed: a flag for the people the source names, advice on handling it, or context.

Flags and context, not rated by dose

  • Brazil nuts, raw

    Context

    1.55
    per serving
    Bq 226Ra (plus 1.43 Bq 228Ra)

    Barkleit 2025 · grade B

    How it’s rated

    Context only (not scored; no health-based Ra intake limit exists, the paper notes). Arithmetic with the paper's adult dose coefficients (2.8e-7 Sv/Bq 226Ra, 6.9e-7 Sv/Bq 228Ra): 30 g gives 0.43 + 0.99 = 1.4 µSv a day, about 0.52 mSv over a year of daily servings, against the 1 mSv/year public dose limit the paper cites; one 5 g nut a day is 0.09 mSv/year. A single batch.

    Intake: 30 g shelled serving, daily · Level in the food: 51.6 mBq/g (226Ra specific activity, whole nuts, mean ± standard deviation 51.6 ± 3.7 (literature 17-205); 228Ra 47.7 ± 3.0 (literature 18-100), n = 1)

    Measured on: Barkleit 2025: one commercial batch of whole Brazil nuts (n not stated; ± is the measurement standard deviation), gamma spectrometry; Germany

Sources