चित्र:PSM V74 D233 Thorium radioactive incandescent gas mantle placed above plant seeds.png

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बिबरणPSM V74 D233 Thorium radioactive incandescent gas mantle placed above plant seeds.png	English: Thorium radioactive incandescent gas mantle placed above plant seeds
तारीख	१९०९
स्रोत	Popular Science Monthly Volume 74 (January to June 1909), Page 229, Fig. 8.
लेखक	Unknown authorUnknown author

Experiment on the effect of radiation (from unburned thorium gas mantle) on the germination and growth of timothy grass seed.

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