Is Cesium-137 (¹³⁷Cs) safe for babies and kids?
Very high risk for kidsNot medical or professional safety advice, and not a substitute for a qualified clinician — consult one. Full disclaimer →
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 riskInfants 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.
Risk for pregnant and nursing people
Severe riskPregnancy 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.
Regulatory consensus
2 regulatory and scientific bodies have classified Cesium-137 (¹³⁷Cs). The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| IARC | — | Group 1 | ionizing radiation (all sources) |
| FDA | — | Approved | Prussian 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):
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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 dataSources (8)
- IARC Monographs Volume 100D (2012): Cesium-137 is Group 1 via the internally-deposited beta-particle-emitter category ("Internalized radionuclides that emit beta particles are carcinogenic to humans, Group 1"). IARC found evidence for caesium-137 ALONE inadequate — the Group-1 basis is the category / fission-product mixtures, not the individual nuclide. (2012) — regulatory
- 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
- US EPA Radionuclide Basics: Cesium-137 (physical half-life ~30 yr; beta/gamma emitter; fission product) (2020) — regulatory
- 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
- ATSDR Toxicological Profile for Cesium (2023) — regulatory
- ICRP Publication 103 — 2007 Recommendations of the International Commission on Radiological Protection (2007) — regulatory
- IAEA Chernobyl Forum: Environmental and Health Consequences of the Chernobyl Accident — Cs-137 Long-Term Surface Contamination (2006) — regulatory
- UNSCEAR 2013 Report Volume I — Sources, Effects and Risks of Ionizing Radiation: Levels and Effects of Radiation Exposure Due to the Nuclear Accident After the 2011 Great East-Japan Earthquake (Cs-137 ground deposition) (2013) — 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 →