: He was the first to realize that beta particles were identical to the high-speed electrons recently discovered by J.J. Thomson.
: In 1901, after being accidentally burned by a vial of radium in his pocket, he realized that radioactivity could affect living tissue. This led to the birth of radiotherapy for treating cancer. Awards and Legacy Henri Becquerel – Facts - NobelPrize.org antoine henri becquerel
: Days later, he developed the plate and found a clear, dark image of the crystals—meaning they were emitting "penetrating rays" spontaneously, without any external energy source like the sun. : He was the first to realize that
: On a cloudy day in Paris, he placed uranium crystals on a photographic plate wrapped in black paper and tucked them in a dark drawer. antoine henri becquerel