div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: X-Ray Irradiation of Cellulose Acetate src=https:reader030vdocumentinreader030viewer2022020312575067f61a28ab0f07adf2dahtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1950 Nature Publishing Grouppdiv