Oversættelse

Becquerel's working hypothesis was that a body had to luminesce to emit penetrating radiation such as Röö;ntgen had found. His technique was to wrap a photographic plate in light tight black paper, position the mineral on the plate, and leave the experiment on his window sill where sunlight would stimulate the mineral to glow. At a meeting of the Academy of Sciences on 24 February 1896, he claimed success, reporting that several materials in particular, phosphorescent crystals of potassium uranyl sulfate emitted rays that penetrated thick black paper and exposed the photographic plate. This exposure was little more than a smudge. To refine the results and to make them more attractive to others Becquerel also placed coins and other thin, metallic objects under the crystals, producing interesting silhouettes and showing their penetrating power. It must, however,be stated that X-rays, which produced far sharper photographic images in less time were overwhelmingly more popular.

Kan du hjælpe mig med at oversætte de der er markeret med fed, Taak :) ?