Atmospheric 14C, New Zealand[5] and Austria[1]. The New Zealand curve is representative for the Southern Hemisphere, the Austrian curve is representative for the Northern Hemisphere. Atmospheric nuclear weapon tests almost doubled the concentration of 14C in the Northern Hemisphere
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![Atmospheric 14C, New Zealand[5] and Austria[1]. The New Zealand curve is representative for the Southern Hemisphere, the Austrian curve is representative for the Northern Hemisphere. Atmospheric nuclear weapon tests almost doubled the concentration of 14C in the Northern Hemisphere](image_science_archive_68/010701_68/178500_600px-Radiocarbon_bomb_spike.svg_68.jpg)
