Nicholas, I believe the Australian Quarantine and Inspection Service regularly irradiates biological material with gamma radiation. An example can be seen at https://www.adelaide.edu.au/acad/images/Import%20Conditions%20Database%20-%20ICON%20-%20AQIS.pdf . They do it for material entering Australia and I presume they would do it for material exiting Australia as well. HH ?????????? Heok Hee Ng Raffles Museum of Biodiversity Research Department of Biological Sciences National University of Singapore 6 Science Drive 2 #03-01 Singapore 117546