Baby Safety / Compounds / Plutonium-239

Is Plutonium-239 safe for babies and kids?

Severe risk for kids

Not medical or professional safety advice, and not a substitute for a qualified clinician — consult one. Full disclaimer →

Infants are more vulnerable to Plutonium-239 than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

What is plutonium-239?

Also known as: Plutonium Pu-239, 239Pu, 15117-48-3, Plutonium, isotope of mass 239.

IUPAC name
plutonium-239
CAS number
15117-48-3
Molecular formula
Pu
Molecular weight
239.05 g/mol
SMILES
[239Pu]
PubChem CID
61782

Risk for babies

Severe risk

Infants are more vulnerable to Plutonium-239 than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

Neonates and infants up to 12 months have incomplete blood-brain barrier development, immature Phase I/II metabolic enzymes (particularly CYP3A4, UGT1A1), and higher gastrointestinal permeability. Equivalent doses produce higher internal concentrations and longer residence times.

What to do: Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Risk for pregnant and nursing people

Context-dependent

Pregnancy alters the metabolism and distribution of Plutonium-239, potentially increasing fetal exposure. The developing embryo/fetus is vulnerable during organogenesis (weeks 3-8) and neurological development. Placental transfer should be assumed.

No specific reproductive toxicity data identified, but pregnancy-specific safety data is limited for most chemicals. Precautionary minimization of exposure is recommended.

What to do: Minimize exposure during pregnancy and lactation. Consult healthcare provider regarding specific risks. Consider alternative products with lower hazard profiles.

Regulatory consensus

4 regulatory and scientific bodies have classified Plutonium-239. The classifications differ — that's the data.

AgencyYearClassificationNotes
NRC1991Special nuclear material; ALI inhalation 6 nCi/year (10 CFR 20)
ICRP2012Dose coefficient inhalation: 1.2×10⁻⁴ Sv/Bq (Publication 119)
EPA2000MCL for combined alpha emitters: 15 pCi/L (40 CFR 141)
IARC2001Group 1 — Carcinogenic to humans (plutonium and plutonium compounds)

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where kids encounter plutonium-239

  • Nuclear
  • Environmental

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Plutonium-239:

  • Low-enriched uranium (LEU) fuel
    Trade-offs: Cannot be used in breeder reactors. Lower energy density per fuel cycle. Requires enrichment infrastructure.
    Relative cost: Lower fuel cost but higher enrichment cost
  • Thorium-232 fuel cycle
    Trade-offs: Requires U-233 breeding. No commercial-scale implementation yet. Different waste profile.
    Relative cost: Potentially lower long-term

Frequently asked questions

Is plutonium-239 safe for kids?

Infants are more vulnerable to Plutonium-239 than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

What should I do if my child is exposed to plutonium-239?

Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Why do regulators disagree about plutonium-239?

Plutonium-239 has been classified by 4 agencies including NRC, ICRP, EPA, IARC, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

See Plutonium-239 in the baby app

Look up products containing plutonium-239, compare to alternatives, and explore the full data record.

Open in baby View raw API data

Sources (6)
  1. IARC Monographs Volume 100D (2012): "Plutonium-239 is carcinogenic to humans (Group 1)" — sufficient evidence in humans (Mayak/Hanford worker cohorts; cancer of lung, liver and bone). INDIVIDUALLY evaluated. (2012) — regulatory
  2. US EPA Federal Guidance Report No. 13: Cancer Risk Coefficients for Environmental Exposure to Radionuclides — Plutonium-239 inhalation slope factors (1999) — regulatory
  3. ICRP Publication 119 (2012): Compendium of Dose Coefficients based on ICRP Publication 60 (Pu-239 dose coefficients; see also ICRP 130, 2015) (2012) — regulatory
  4. Wing S, Richardson D, Wolf S, Mihlan G — Plutonium-related work and cause-specific mortality at the US DOE HANFORD Site (Am J Ind Med 2004; PMID 14748046) (2004) — study
  5. US DOE 10 CFR Part 835 — Occupational Radiation Protection (2018) — regulatory
  6. NIOSH Radiation Dose Reconstruction Program (Energy Employees Occupational Illness Compensation Program, EEOICPA) (2020) — regulatory

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for medical, pediatric, legal, or regulatory advice. Why we built ALETHEIA →