I had a newer form of brachytherapy twice called HD-IORT, High Dose Intraoperative Radiation Therapy, which uses the same radiation accelerator as HDR Brachytherapy. Brachytherapy, internal radiation, is given in low dose rate, high dose rate, Pulse Rate, temporary and permanent seeds too, like with prostrate cancer.

IORT was somewhat similar, and is used during the tumor resection, and radiation applicators placed directly on the tumor and given in high dose, like 12Gy, which is actually equivalent to 3x that of external beam, followed by chemoradiation after healing.

I have some information on Brachytherapy that you may find of interest.

http://www.americanbrachytherapy.org/patients/index.cfm

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