What is calcium 41 mass unit?

Calcium-41 (Ca-41) is a stable isotope of calcium with a mass number of 41, meaning it has 20 protons and 21 neutrons in its nucleus. It has an Atomic Mass of approximately 40.978 amu (atomic mass units). Ca-41 is not a naturally abundant isotope, but it can be produced in nuclear reactions and has applications in radiometric dating and studies of calcium metabolism in biological systems.