div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=rapid-analysis-of-erbium-by-neutron-activation-followed-by-ray-spectrometryhtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: Rapid Analysis of Erbium by Neutron Activation followed by γ-Ray Spectrometry loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentssitereader031viewer2022020405575068171a28ab0f07ae8d3ahtml5thumbnails1jpg width=140 height=200 divp© 1960 Nature Publishing Grouppdiv