I'm sorry, I don't know about irradiation treatments in Tasmania. So I just did a quick search and found this on the website :
You must be able to use irradiation there. So, maybe you can find someone through that website, or by contacting them directly. I haven't heard any more about chemical treatments for the Flow Frames. I will follow-up now for you, and hopefully hear back soon.
I found it with this search
All bees, bee products, bee collected pollen, used hive components and beekeeping equipment must be from hives free of Notifiable diseases. All bees, bee products, pollen and used beekeeping fittings must not be from a quarantine property/area or an area subject to restrictions on movements imposed by other jurisdictions.
Pollen used for feeding to bees must be irradiated to a minimum of 15 kilograys prior to entry or immediately after introduction.
In addition to the above, see below for conditions related to specific diseases or jursidictions.
American Foul Brood disease (AFB)
Bees (including queen cells, queen bees, escorts and packaged bees), bee products, pollen or used beekeeping fittings must only be from AFB free apiaries. The following form must be completed –
Introduction of Bees, Livestock Products of Bees or Apiary Fittings into Victoria (No inspection is required) [MS Word Document - 23.2 KB]
Notwithstanding the above, subject to required labelling and treatment, honey, beeswax or pollen extracted from, or used beekeeping fittings from, hives affected by AFB may be introduced. Honey and beeswax must be sent directly to a processing plant, whilst pollen and apiary fittings must be irradiated with gamma irradiation at an approved plant. The following form must be completed –
Introduction of Apiary Fittings or Extracted Honey from an Apiary Affected with American Foul Brood into Victoria [MS Word Document - 23.1 KB] (Schedule 7) No inspection required
No bees, pollen or used hives and other used beekeeping fittings may be introduced into Victoria from Tasmania.
Comb honey may be introduced providing that before the comb is introduced, the comb is frozen to minus 15 degrees centigrade for 24 hours, it is stored and transported in bee-free containers and vehicles, it is cut and packed in a bee free area and no other comb honey was on the premises whilst it was being processed. The above relevant form must accompany the comb honey, as well as data temperature logs endorsed by a government apiary officer.