11. Stock said most patients can resume work immediately after seed implantation and continue working during external radiation treatments. 12. The external radiation treatment, which he started last week, is the normal follow-up and lasts about five weeks. 13. Dose due to external radiation tends to decrease with depth because of the shielding effects of outer tissues. 14. Patients may still require external radiation and other chemotherapy, especially if the cancer has spread beyond the thyroid. 15. Total recorded rem ) to more than 1 sievert ( 100 rems ), due primarily to external radiation . 16. The second form is external radiation . 17. He ultimately returned to Austin 23 times for external radiation treatment to fill in spots the seeds had missed. 18. Workers exposed to more than 20 rems of external radiation were at high risk for blood and lymph cancers. 19. A third study from Canada is comparing external radiation and a technique to freeze the prostate known as cryotherapy. 20. The single dose is equivalent to that of a full course of standard external radiation therapy to the whole breast.
