Dr. Gallbae on Instagram: ". . Here is how the lymphoscintigraphy helps to localize the sentinel lymph nodes with a Geiger counter. . Prior to this, a radiologist injected radioactive Technetium-99 around the nipple on the side of the breast cancer. This radioactive tracer diffused into the lymphatic channels and collected into the first lymph nodes of the armpit, the Sentinel Lymph nodes. . This video shows how the Geiger counter is used to localize where these SLNs are by sound. It’s like an o