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ความคิดเห็นที่ 92 |
เกี่ยวกับกำบังรังสีด้วยน้ำ (อ่านด้วยนะ อุตส่าห์หามาป้อนแล้ว)
http://www.freepatentsonline.com/5929458.html Radiation shield United States Patent 5929458 In a radiation shield in which a bag having flexibility is filled with a shielding liquid, a side of the bag is integrally equipped with reinforcement members which have a higher strength than the material of the bag and are longitudinally disposed and spaced horizontally. The bag filled with the shielding liquid is restrained from being deformed (swollen in its lower portion) by the reinforcement members having a higher strength than the material of the bag, so that the radiation shield is maintained in a predetermined thickness and exhibits predetermined performance.
http://www.technovelgy.com/ct/Science-Fiction-News.asp?NewsNum=151 NASA's New Radiation Shielding First Proposed By John W. Campbell In 1936 NASA engineers are working on a clever new idea for shielding astronauts from cosmic rays. If you put the tanks containing the fuel and water needed for the journey on the outside of the living space, they can be used for shielding. Just like science fiction writer John W. Campbell first proposed in 1936.
http://en.wikipedia.org/wiki/Radiation_protection Shielding design
Shielding reduces the intensity of radiation exponentially depending on the thickness. This means when added thicknesses are used, the shielding multiplies. For example, a practical shield in a fallout shelter is ten halving-thicknesses of packed dirt, which is 90 cm (3 ft) of dirt. This reduces gamma rays by a factor of 1/1,024, which is 1/2 multiplied by itself ten times. Halving thicknesses of some materials, that reduce gamma ray intensity by 50% (1/2) include[1] (see also Kearney, ref):
Material ↓ Halving Thickness, inches ↓ Halving Thickness, cm ↓ Density, g/cm³ ↓ Halving Weight, g/cm² ↓ lead 0.4 1.0 11.3 12 concrete 2.4 6.1 3.33 20 steel 0.99 2.5 7.86 20 packed soil 3.6 9.1 1.99 18 water 7.2 18 1.00 18 lumber or other wood 11 29 0.56 16 depleted uranium 0.08 0.2 19.1 3.9 air 6000 15000 0.0012 18
Column Halving Weight in the chart above indicates mass of material, required to cut radiation by 50%, in grams per square centimetre of protected area.
The effectiveness of a shielding material in general increases with its density.
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5 ม.ค. 53 08:52:57
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