Pre-clinical radiotracer biomedical research involves the use of compounds labeled with radioisotopes, including radio-ligand bio-distribution studies, cell binding studies, immune cell labeling techniques, and α-based therapies. Before this Micro-Dose Calibrator, measurement of pre-clinical level dosage for small animal studies was inaccurate and unreliable. This dose calibrator is a prototype ready for customer testing and scale-up. It is designed to accurately measure radioactive doses in the range of 50 nCi (1.8 kBq) to 100 µCi (3.7 MBq) with 99% precision. The NCI seeks co-development or licensing to commercialize it. Alternative uses will be considered.