LYCOS RETRIEVER 
Boron: Occurs
built 277 days ago
Boron is one of the simplest of atoms. The only simpler ones are hydrogen, helium, lithium and beryllium. Boron has chemical symbol B, atomic number 5, and occurs naturally as 80% B11 and 20% B10. The latter isotope has a high cross section for thermal neutron absorption, 3800 barns. Thermal neutron counters are often filled with BF3 gas. The gamma ray from the neutron capture reaction B10(n,-)B11* followed by decay of the B11* to an α plus Li7 produces ionization which is then detected.
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Boron toxicity on Michigan crops is usually limited to situations where boron-containing fertilizers are used at planting time on highly sensitive crops such as dry edible beans, corn, grass and small grains. Toxicity to crops has ... occurred when sensitive crops were planted where fertilizers containing boron had been used earlier in the season. Similar problems may occur where sensitive vegetable crops are planted with high rates of boron in the starter fertilizer.
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Boron is extremely safe when taken at the recommended dosages of 3 to 9 milligrams daily. If extremely high dosages are used (greater than 500 milligrams per day), nausea, vomiting, and diarrhea may occur (Murray, 1996).
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