You're right. We can't accurately value the company, imo.
Found it interesting that a report in April said radiopharma market will be $5.5B by 2017 and pointed to shortage of Tc-99m and reactor shutdowns as being a threat to the industry.
Then a report earlier this month said radiopharma market will be $12.2B by 2018 and basically stated Tc-99m is currently the most widely used radioisotope in medical application, but that is changing. Newer generators (PET generators) should see double-digit growth.
What I take from that is PET is going to grow substantially in the coming years. Radiopharma will be important to Positron's growth. But Positron is more than a radiopharma company.