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Louis Harold Gray was born on 10 November, 1905. He was an English physicist who worked mainly on the effects of radiation on biological systems.
Louis Harold Gray was one of the earliest contributors to the field of radiobiology. This science combined medicine, biology and physics, that was the reason of such interest for the scientist. Besides, he wanted to apply his knowledge for the benefit of mankind. Thus, Louis Harold Gray started the medical research to develop the cancer treatment using ionizing radiation.
He defined a unit of radiation dosage (absorbed dose) which was later named after him as an SI unit, the gray.