I checked some of my records, and due to a recurrences in 2011, the RO indicated from my initial radiation that the bilateral neck has been treated, so that level V on the left neck received between 56Gy-63Gy depending on the proximity to level IV, so the brachial plexus was at its dose limit at 63Gy, and reiiridation was denied. I think the doses vary by site, patient, and may depend if surgery was done, induction chemo, concurrent radiation, N0 vs multiple nodes, and dose limits to nearby vital structures. I would think the tumors, involved node (s) would get the highest doses.

10/09 T1N2bM0 Tonsil
11/09 Taxo Cisp 5-FU, 6 Months Hosp
01/11 35 IMRT 70Gy 7 Wks
06/11 30 HBO
08/11 RND PNI
06/12 SND PNI LVI
08/12 RND Pec Flap IORT 12 Gy
10/12 25 IMRT 50Gy 6 Wks Taxo Erbitux
10/13 SND
10/13 TBO/Angiograph
10/13 RND Carotid Remove IORT 10Gy PNI
12/13 25 Protons 50Gy 6 Wks Carbo
11/14 All Teeth Extract 30 HBO
03/15 Sequestromy Buccal Flap ORN
09/16 Mandibulectomy Fib Flap Sternotomy
04/17 Regraft hypergranulation Donor Site
06/17 Heart Attack Stent
02/19 Finally Cancer Free Took 10 yrs