What salvage EBRT dose would you recommend for radiation-naive patients with Hodgkin's Lymphoma who are refractory to chemotherapy and immunotherapy and decline to undergo transplant?  

This is likely a palliative scenario, thus, I would try to limit toxicity and time spent on treatment. 30-36/3 appears reasonable, in my opinion.

Sorry, but more information is needed to answer this question. What was the stage at diagnosis, sites of disease at diagnosis, date of diagnosis, extent of disease presently, systemic symptoms, age of the patient, and general medical condition?

There is retrospective data for RT salvage for early-stage localized disease if it was not given upfront. Favorable predictors include a longer time interval from initial treatment. In the local recurrence scenario, I would go to about 36-40 Gy absent chemotherapy, perhaps a bit higher to 45 Gy if b...