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Notes:

A 241-Am/Be probe lost down a well of an undisclosed location was destroyed during the recovery process.

This should raise concerns about using neutron and other radionucleotides sources in well-logging.

Amounts of radiation released into the environment from this 200GBq probe also was not disclosed.

Neutron-well-logging into the Dakota Sandstone and Morrison Formation is not advisable from a health standpoint, since epithermal neutrons create 239-Pu from 238-U (depleted uranium) and from Uranium reported to be present, naturally, in these formations.