ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] As g rays cannot be focused, the formation of an image depends upon an estimation of particle trajectories. Generally, this necessitates the elimination of all trajectories outside a narrow range of incidence angles. This has been achieved using lead collimators. Such systems give directional ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/251132a0
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