填空题

Karl Wilhelm Rontgen (36) people with the first x-rays in 1895; this was (37) three years later by the discovery of radium by Pierre and Marie Curie. But who were they In 1894, Marie and Pierre Curie met while studying in Paris. Their marriage on 25th July 1895 marked the start of a (38) which was to receive worldwide recognition. The Curies discovered radium, a (39) substance, in uranium oxide ore. They developed techniques for (40) it, but first did not fully understand its (41) Pierre Curie used to carry radium around in his waistcoat pocket and could not understand why he was developing a massive (42) on his chest. This would have been (43) , but Pierre’s life was cut short in 1906 when he was knocked down and killed by a horse and cart in the street. (44) . Marie and Pierre Curie were awarded a joint Nobel Prize in 1904, followed up by a second one for Marie in 1911. Their research was crucial in the development of x-rays in surgery. (45) . The International Red Cross made her head of its Radiological Service and she held training courses for medical orderlies and doctors in the new techniques. (46) . She died in 1934 from leukaemia, due to exposure to high-energy radiation used in her research. Radiation has since been used to treat cancer worldwide.