Marie Curie i think
Henri Becquerel was the first to discover radiation in 1896 while he was studying phosphorescent materials.
Penzias and Wilson discovered background radiation on October 7,1965.
Wilhelm Conrad Roentgen on November 8, 1895, discovered the X-Ray.
Primordial background radiation is in actuality Cosmic Microwave Background. To discover just what Cosmic Microwave Background theories are, visit the URL posted below:http://www.astro.ucla.edu/~wright/CMB.html
Henri Becquerel discovered that uranium salts emit a form of radiation that can penetrate opaque objects and fog photographic film. This phenomenon led to the discovery of radioactivity.
Nuclear engineers work in labs working with radiation and sometimes even actual nuclear product. They learn how to work around problems and discover new ways radiation can be helpful or harmful to the human body.
Pulsars were discovered by accident in 1967 when Jocelyn Bell, working with Antony Hewish were looking for twinkling sources of radio radiation.
Astronomers discover black holes in the universe by observing the effects they have on nearby objects, such as stars and gas. They use telescopes to detect X-rays and other forms of radiation emitted by black holes, as well as studying the gravitational influence they have on surrounding matter.
Wilhelm Roentgen, Professor of Physics in Worzburg, Bavaria, was the first person to discover the possibility of using electromagnetic radiation to create what we now know as the x-ray.
Marie Curie did not invent the X-ray machine; it was actually invented by Wilhelm Conrad Roentgen in 1895. However, Marie Curie did pioneer research on radioactivity and its uses in medicine, which contributed to advancements in X-ray technology.
Max Planck discovered that radiant energy was a proportional to the frequency of the radiation, E=hf and the constant of proportionality is Planck' Constant, h.
Henri Becquerel was the first to discover that a penetrating radiation came from uranium, even if the uranium had not been exposed to sunlight. He thus showed that radioactivity was a fundamental property of uranium. Prior to his discovery, it was thought that any such radiation coming from uranium was the result of its interaction with sunlight.