Leonidas D. Marinelli dating history

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Leonidas D. Marinelli (28 November 1906 – 13 September 1974) was the American radiological physicist who founded the field of Human Radiobiology
In 1942, Marinelli established the principles for dosage determination of internal radioisotopes in the human body
In 1946, he developed the systematic dosimetry to distribute radioactive iodine to treat all locations of the metastases of a patient's thyroid cancer
In 1950, he invented the Whole Body Counter that directly detected radioactive elements emitted from individuals who were previously contaminated in factories using radium, in nuclear industries, or by nuclear fallout.
In 1953 he improved and applied the "twin" scintillation low-level gamma-ray crystal spectrometry method to detect and locate elements that are naturally radioactive in the human body These methods were quickly copied in laboratories throughout the world and yielded insights into the human metabolisms of many elements and their compounds.
In 1956, he developed the twin scintilltor method for dosimetry and spectrometry of fast neutrons and its application to the measurement of cosmic-ray neutron background
Using this method, his investigations obtained the total content of natural potassium in the human body