radon dosimeter mass number Radon dosimeters are radiation dosimeters used to measure the presence and concentration of radon gas (Rn-222), a radioactive noble gas that can accumulate in buildings and pose health risks. Different types of radon detectors use various detection methods, based on the radioactive decay products of radon. radon detector The atomic mass (ma or m) is the mass of an atom. The protons and neutrons of the nucleus account for nearly all of the total mass of atoms, with the electrons and nuclear binding energy making minor contributions. It is measured in Daltons (unit). planned irradiation heavy ion radiation radon dosimeter mass number Radon dosimeters are radiation dosimeters used to measure the presence and concentration of radon gas (Rn-222), a radioactive noble gas that can accumulate in buildings and pose health risks. Different types of radon detectors use various detection methods, based on the radioactive decay products of radon. radon detector The atomic mass (ma or m) is the mass of an atom. The protons and neutrons of the nucleus account for nearly all of the total mass of atoms, with the electrons and nuclear binding energy making minor contributions. It is measured in Daltons (unit).