For the unborn child the risk of harm depends on several factors
- The stage of fetal development
- The duration of exposure
- The exposure dose
- Dates of exposure during pregnancy
The estimated risk to a child of a serious health defect from prenatal exposure to Cosmic Radiation (flying for 7 months at 100 hours per month, with an exposure of 0.58mSv/100 block hours - say continual work on the Athens - New York route) is 1 in 1,100.
