Baby Safety / Compounds / Cesium-137 (¹³⁷Cs)

Is Cesium-137 (¹³⁷Cs) safe for babies and kids?

Very high risk for kids

Infants are more vulnerable to Cesium-137 (¹³⁷Cs) 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 cesium-137 (¹³⁷cs)?

The IUPAC name is cesium-137.

Also known as: cesium-137, 137Cs radioisotope, Cesium Cs-137, Caesium-137.

IUPAC name
cesium-137
CAS number
10045-97-3
Molecular formula
Cs
Molecular weight
136.907089 g/mol
SMILES
[Cs]
PubChem CID
5486527

Risk for babies

Very high risk

Infants are more vulnerable to Cesium-137 (¹³⁷Cs) 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

Severe risk

Pregnancy alters the metabolism and distribution of Cesium-137 (¹³⁷Cs), potentially increasing fetal exposure. The developing embryo/fetus is vulnerable during organogenesis (weeks 3-8) and neurological development. Placental transfer should be assumed.

Known reproductive toxicant (GHS H360) or confirmed endocrine disruptor. Placental transfer is presumed. Fetal exposure during critical developmental windows may cause structural malformations, growth restriction, or functional deficits.

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

Regulatory consensus

2 regulatory and scientific bodies have classified Cesium-137 (¹³⁷Cs). The classifications differ — that's the data.

AgencyYearClassificationNotes
IARC—Group 1ionizing radiation (all sources)
FDA—ApprovedPrussian blue (ferrihexacyanoferrate) as treatment/binder

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 cesium-137 (¹³⁷cs)

  • Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
  • Occupational Environments — Factories, Warehouses, Transportation vehicles

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Cesium-137 (¹³⁷Cs):

  • Shielding / distance / time (radiation protection)
    Trade-offs: Removes 95-99% of dissolved contaminants including metals, PFAS, nitrates; wastes 2-4 gallons per gallon produced (improving with newer systems); removes beneficial minerals; $0.05-0.25/gallon; requires pre-treatment for longevity.
    Relative cost: 1.2-2×

Frequently asked questions

Is cesium-137 (¹³⁷cs) safe for kids?

Infants are more vulnerable to Cesium-137 (¹³⁷Cs) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

What products contain cesium-137 (¹³⁷cs)?

Cesium-137 (¹³⁷Cs) appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).

What should I do if my child is exposed to cesium-137 (¹³⁷cs)?

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.

See Cesium-137 (¹³⁷Cs) in the baby app

Look up products containing cesium-137 (¹³⁷cs), compare to alternatives, and explore the full data record.

Open in baby View raw API data

Sources (3)
  1. IAEA: The Radiological Accident in Goiânia — Cesium-137 Orphan Source Contamination, 4 Deaths, 250 Exposed, Prussian Blue Treatment, and Lessons for Orphan Radioactive Source Control (1988) (1988) — regulatory
  2. US NRC: Cesium-137 Fact Sheet — Physical Half-Life 30.17 Years, Beta/Gamma Emissions, Biological Half-Life ~70 Days Adults (~30 Days Children), Prussian Blue FDA-Approved Treatment, Food Monitoring Post-Nuclear Accident (2020) (2020) — regulatory
  3. WHO: Health Effects of the Chernobyl Accident — Cesium-137 and Iodine-131 Contamination, Childhood Thyroid Cancer, Food Chain Contamination, Post-Accident Radiation Dose Assessment, and 20-Year Health Outcomes (2006) (2006) — regulatory

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