Overview
- Published in Scientific Reports, the multi‑institution study analysed breastmilk from 40 mothers sampled between October 2021 and July 2024 in Bhojpur, Samastipur, Begusarai, Khagaria, Katihar and Nalanda.
- Uranium-238 was found in every sample with concentrations up to 5.25 µg/L, with Katihar showing the highest single value and Khagaria the highest average level.
- Risk modelling estimated about 70% of infants could face potential non‑carcinogenic effects from ongoing exposure, while no immediate carcinogenic risk was detected.
- Measured breastmilk levels were below the WHO drinking‑water guideline of 30 µg/L and there is no established permissible limit for uranium in breastmilk.
- Researchers cite groundwater and food-chain pathways as likely contributors, note earlier high uranium readings in Bihar wells, report Geological Survey of India inquiries, and call for wider biomonitoring, water testing, filtration access and clinical follow‑up without stopping breastfeeding.