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Home > All Images > 1987 > August > 21 Aug 1987

Images Dated 21st August 1987

Available as Framed Prints, Photos, Wall Art and Gift Items

Choose from 5 pictures in our Images Dated 21st August 1987 collection for your Wall Art or Photo Gift. Popular choices include Framed Prints, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery.


cosmic ray atomic nuclei Featured 21 Aug 1987 Print

cosmic ray atomic nuclei

Emulsion photograph showing the tracks of various cosmic ray nuclei, ranging from a hydrogen nucleus to an iron nucleus. The more protons a nucleus contains, the higher its positive electric charge & the greater its ability to ionise; the more it ionises, the denser its track in emulsion. Hydrog- en has 1 proton & produces a barely visible track. Ionisation depends on the square of the charge; so lithium's 3 protons have 9 times hydrogen's charge & produce a track 9 times denser. Iron, with 26 protons, produces a track 676 times denser than hydrogen. The wispy strands that adorn the denser tracks are "delta rays" - electrons knocked out of atoms in the emulsion by the passing nucleus

© POWELL FOWLER PERKINS/SCIENCE PHOTO LIBRARY