Gamma probe device enables surgeons to identify radio-labelled tissue during pre-operation and intra-operation for radio guided diagnosis and surgery. Surgeons often find it difficult to locate tissues, such as tumors, parathyroid glands, and lymph nodes, within the human body. Therefore, proper utilization of a gamma probe allows the surgeon to make a smaller incision and the tissues of interest have been located. One of the most common uses of gamma probes is in one of the surgical procedure called Sentinel Node Biopsy, used to determine whether a tumor has metastasized, or spread to new locations. This biopsies are common for staging breast cancer and melanoma, and are becoming increasingly popular in staging other forms of cancer also. The carrier substance or radionuclide such as Technetium-99m or Nano colloid or sestamibi are used as tracer for gamma probe device. Sentinel Node Biopsies most commonly use a radioisotope called Technetium-99m. Gamma probe device are av...