Non-Hodgkin lymphoma is broadly divided into two major groups: B-cell lymphomas (which develop from abnormal B-lymphocytes, which is most common), and T-cell lymphomas (which develop from abnormal T-lymphocytes). Lymphocytes are a type of white blood cell that helps the body fight infections.
The atomic number of radon (Rn) is 86 and the atomic weight of Rn is 222 grams/mole.
Radon is a decay product of the radium salts used in the luminous paint of the numerals. In this 1950's clock, the glass casing has accumulated 10 -16 gram) of radon. Image adapted with permission from Prof James Marshall 's (U. North Texas, USA) Walking Tour of the elements CD.