Many radiation oncologist would be deeply concerned at this point, as some believe that salvage radiation is most effective if administered below a threshold of .50. You are almost there already, wouldn't take much to push over the line.
The usual thinking, is if there is residual prostate material left, it will show up in your PSA right after surgery, and hover around a fairly small number, i.e. .1 to .2, and then kind of stay there. You have a pretty good doubling rate going on there, if it were me, just my opinion, I would already have been with a good radiation and/or medical oncologist by now, in case your window for a secondary curative treatment is still possible.
David in SC
Age: 58, 56 dx, PSA: 7/07 5.8, 10/08 16.3
3rd Biopsy: 9/08 7 of 7 Positive, 40-90%, Gleason 4+3
open RP: 11/08, on catheters for 101 days
Path Rpt: Gleason 3+4, pT2c, 42g, 20% cancer, 1 pos marg
Incont & ED: None
Post Surgery PSA: 2/09 .05,5/09 .1, 6/09 .11. 8/09 .16
Post SRT PSA: 1/10 .12, 4/8 .04, 8/6 .06 11/10 Not taking it
Latest: 6 Corr Surgeries to Bladder Neck, SP Catheter since 10/1/9, SRT 39 Sess/72 gy ended 11/09, 21 Catheters, Ileal Conduit Surgery 9/23/10