Internal Examination of a Newly Hatched Alligator. A professional can determine the gender of a very small baby alligator, 6 to 10 inches long. One method is to place the creature on its back and hold open his vent with round-tipped tweezers or forceps, with a helper's assistance.
Technetium is the only element below uranium that does not exist on Earth. It is a synthetic (man-made) element produced in a particle accelerator. For many years, chemists knew that an element with atomic number 43 must exist, based on an empty spot in the periodic table.
Tc-99m/Tc99. Technetium-99m is the most prevalent diagnostic agent in nuclear medicine. It accounts for 85% of all diagnostic scans and is used around 20 million times per year (1). It is through its unique characteristics as a metastable radioactive isotope that gives it this dominance in the field.