8N6not JC.Radiation accidents over the last 60 years[J].J Rad Prot,2009,29(3):301-320.
9International Atomic Energy Agency.Radiation Protection and Safety inWell Logging(DS419)[EB/OL].(2013-06-20)[2014-07-08].http://www.ns.iaea.org/downloads/standards/drafts/ds419.pdf.
10International Atomic Energy Agency.Radiation Protection and Safety inNuclear Gauges(DS420)[EB/OL].(2013-06-20)[2014-07-08].http://www.ns,iaea.org/downloads/standards/drafts/ds420.pdf.