Seawater contains 0.00015g U per ton. There is considerable irony that Australia, the world's second largest exporter of uranium, is making the importation of trifling, but urgently required quantities of uranium all but impossible. Again IATA should have great concerns about the uranium carried in jumbo jets. The danger from uranium is not so much from radiation but from tiny uranium particles, which may be lodged in the lung. These produce the heavy gas, Radon, as a decay product, which causes lung cancer.
Radon is the killer of underground miners or even inhabitants of granite cottages.
Happily UA is fully water soluble, so it does not lodge in the lung and is very unlikely to cause these cancers. Also, UA is not a cumulative toxin, so it is not concentrated in the food chain nor would it cause pathological conditions due to increased levels from ongoing minor exposures. Imagine a crash at take-off or landing with 370 kg of uranium ground to dust or turned into smoke particles by fire in an urban area. Considering the quantities of UA we have handled, the perfect safety record, the effective packaging, the mature judgement of IATA and foreign Governments, we must wonder why our Government agencies have introduced these fancy requirements. Contrast our few jars of UA with the abundance of uranium in nature.