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Cytogenetic study in lymphocytes from children exposed to ionizing radiation after the Chernobyl accident
L Padovani1, D Caporossi, B Tedeschi
1Department of Biological and Health Effects, ENEA Casaccia, Rome, Italy.
Insights
Children exposed to Chernobyl fallout show persistent, low-frequency chromosome damage. Whole-body counter data suggests ongoing 137Cs contamination, indicating continuous low-dose radiation effects. This highlights the need for combined dosimetry and cytogenetics in monitoring.
Area of Science:
- Environmental Health
- Radiation Biology
- Pediatric Health
Background:
- The Chernobyl accident caused widespread radioactive fallout, impacting populations in Byelorussian, Ukrainian, and Russian republics.
- Long-term health effects, particularly in children, require ongoing monitoring and assessment.
- Cesium-137 (137Cs) contamination is a significant factor in assessing chronic radiation exposure.
Purpose of the Study:
- To monitor cytogenetic damage in children exposed to Chernobyl fallout.
- To evaluate the relationship between internal 137Cs contamination and chromosome aberrations.
- To assess the feasibility of using combined dosimetry and cytogenetics for radiation exposure management.
Main Methods:
- Cytogenetic analysis of metaphases from 41 children from affected regions.
- Whole-body counter (WBC) analysis to quantify internal 137Cs contamination.
- Scoring of radiation-induced chromosome damage, including stable rearrangements and breaks.
Main Results:
- Radiation-induced chromosome damage was detected at a very low frequency in the studied children.
- The low frequency of dicentrics precluded radiobiological dosimetry due to time elapsed and low doses.
- Whole-body counter data confirmed ongoing 137Cs contamination in the children.
- Observed stable chromosome rearrangements and breaks may indicate persistent effects of continuous low-dose radiation.
Conclusions:
- Cytogenetic damage persists at low levels in Chernobyl-exposed children, potentially due to ongoing 137Cs contamination.
- Combined internal contamination dosimetry (WBC) and cytogenetics are valuable tools for monitoring individual radiation exposure.
- These integrated methods can inform further management strategies for exposed populations.
Abstract:
The present study concerns the monitoring of children from the Byelorussian, Ukrainian and Russian republics exposed to the fall-out of the Chernobyl accident. Cytogenetic analyses have been performed on 41 children coming from different areas and exhibiting varying amounts of 137Cs internal contamination, as evaluated by whole-body counter (WBC) analysis. On a total of 28,670 metaphases scored, radiation-induced chromosome damage is still present, although at a very low frequency. Due to the very low fraction of dicentrics, because of the time elapsed from the accident and the relatively low doses of exposure, radiobiological dosimetry is not possible for these children. However, considering that the WBC data indicate that the children are still exposed to 137Cs contamination, the observed occurrence of stable chromosome rearrangements and breaks may represent the persisting effect of continuous low doses of radiation. The present study also indicates that the parallel use of internal contamination dosimetry and cytogenetics could be usefully employed to monitor individual exposure to radiation and to define further management measures.