PHYS 1070 Lecture Notes - Lecture 23: Isotope, Beta Decay, Gamma Ray
Document Summary
Phys1070: intro physics for life sci - lecture 23: radiation biophysics. Consists of a nucleus at the core with a positive charge. Has protons and neutrons in the nucleus. Electrons orbit the nucleus and have a negative charge. # of electrons in an atom = z (1,2,392) The charge of 1 electron = 1. 6 x 10-19 c. The radius of an atom is a few x10-10m (100000x larger than the radius of a nucleus) The radius of the nucleus inside and atom is a few x10-15 m (100000x smaller than the nucleus of an atom) Obtains an overall positive charge due to the protons occupying space in the nucleus (neutrons have no charge) Contains protons and neutrons of an atom. Contains 99. 98% of the mass for an atom (rest of the atom is basically empty space ) Z = number of protons in the nucleus. N = number of neutrons in the nucleus. Found in the nucleus of an atom.