Kait
Kait
 
 
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Jaggo 27 Nov, 2017 @ 9:08am 
The major natural source of radioactivity in plant tissue is potassium: 0.0117% of the naturally occurring potassium is the unstable isotope potassium-40 (40K). This isotope decays with a half-life of about 1.25 billion years (4×1016 seconds), and therefore the radioactivity of natural potassium is about 31 Bq/g – meaning that, in one gram of the element, about 31 atoms will decay every second.Plants naturally contain radioactive carbon-14 (14C), but in a banana containing 15 grams of carbon this would give off only about 3 to 5 beta rays per second. Since a typical banana contains about half a gram of potassium, it will have an activity of roughly 15 Bq. Although the amount in a single banana is small in environmental and medical terms, the radioactivity from a truckload of bananas is capable of causing a false alarm when passed through a Radiation Portal Monitor used to detect possible smuggling of nuclear material at U.S. ports.
Kait 14 Apr, 2011 @ 8:10am 
:D
Pogson 5 Feb, 2011 @ 9:28am 
gays
draganovicx 19 Sep, 2010 @ 11:28am 
SWARLEY! :D
draganovicx 31 Jul, 2010 @ 5:16pm 
<3
draganovicx 9 Jul, 2010 @ 3:01am 
ha de bäst i usa :DD