Radioactivity is generally used in life sciences for highly sensitive and direct measurements of biological phenomena, and for visualizing the location of biomolecules radiolabelled with a radioisotop
Autoradiograph of Southern blot membrane
Gray (unit)
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The gray is the unit of ionizing radiation dose in the International System of Units, defined as the absorption of one joule of radiation energy per kilogram of matter.
Using early Crookes tube X-Ray apparatus in 1896. One man is viewing his hand with a fluoroscope to optimise tube emissions, the other has his head close to the tube. No precautions against radiation exposure are being taken—its hazards were unknown at the time.
Monument to the X-ray and Radium Martyrs of All Nations erected 1936 at St. Georg hospital in Hamburg, commemorating 359 early radiology workers.