If this nuclear chemical reaction occurred, the nitrate ion (NO3 -) was converted to carbonate ion (CO3 2-). Hence, the carbon in the product CO3 2would be carbon-14, a radioisotope. The passengers and crew members on flights may use in-flight water for hand washing, gargling with mouth wash and as drinking water. Internal exposure to radiation in the form of carbon-14 for these individuals is more likely.