Edward Hope Kirkby They are buried together at Waverley Cemetery. So ended a life of invention largely unrecognised as biographers of George Taylor and Archibald Shaw claimed all the credit for them for Kirkby’s endeavours. Edward Hope Kirkby was a jeweler watchmaker in Williamstown who eventually became a manufacturing electrician making systems of fire protection, in 1908 he invented and patented the first automatic sprinkler alarm. He is first recorded as experimenting with X-ray in September 1896 This is only 9 months after Roentgen presented his discovery of X-rays. He is reported as experimenting with the medical staff at Williamstown Hospital later that
Roentgen (unit) 0.2 roentgen per day in 1934. In 1950, the ICRP reduced their recommended limit to 0.3 roentgen per week for whole-body exposure. The International Commission on Radiation Units and Measurements (ICRU) took over the definition of the roentgen in 1950, defining it as "the quantity of X or γ-radiation such that the associated corpuscular emission per 0.001293 gram of air produces, in air, ions carrying 1 electrostatic unit of quantity of electricity of either sign." The 3 MeV cap was no longer part of the definition, but the degraded usefulness of this unit at high beam energies was mentioned in