The article you linked in your first post refers to the treatment called Selective Internal Radiation Therapy (SIRT). The same treatment goes under a different name: TransArterial RadioEmbolization (TARE), or simply radioembolization.
The treatment uses radioactive chemical element called Yttrium. Yttrium exists in different variants: Y90, Y99, and many others. Y90 is the most common variant used in radioembolization. I've never seen Y99 mentioned before, so I think it must be less common than Y90.
I recommend that you try to search the forum for these terms:
You will get tons of pointers to the older discussions.
Here's the direct link to the forum search page:
Take a look at this discussion... lots of useful information in there.
http://www.cholangiocarcinoma.org/punbb … hp?id=7931