When charged with alcohol vapor and cooled by dry ice, radioactive particles leave “contrails” in the chamber, which are visible by strong side lighting.Includes clear plastic chamber with lid, paper blotters, insulating foam block, instructions and a mail-away coupon for a Pb-210 radioactive source. You must provide ethyl or methyl alcohol, light source (a strong flashlight will do), liquid nitrogen or dry ice, and a plastic dish or paper plate lined with plastic. Also available as a pack of five kits.
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