Change: neutrons. neutrons. 1915 (June) British Roentgen Society proposes
standards for radiation protection workers; includes shielding, restricted
work hours, medical exams; no limits because of lack of units for dose
or dosimeters; voluntary controls.
1916 A. Sommerfeld (Germany) modifies Bohr's
model of electron orbitals to allow elliptical orbits.
1920 Luminous
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