- 1. Si element
- [A trace element that constitutes about 27.6% of the earth's crust in the form of SILICON DIOXIDE. It does not occur free in nature. Silicon has the atomic symbol Si, atomic number 14, and atomic weight 28.09. ( MSH )] (UMLS (CSP) C0037107) =Biologically Active Substance; Element, Ion, or Isotope =Element;
silicon compound | - 3. Sievert
- [Sievert (Sv) is the SI derived unit of equivalent radiation dose. One Sv is received when the actual absorbed dose of ionizing radiation, after being multiplied by the dimensionless factors Q (quality factor) and N (the product of any other multiplying factors), is one joule per kilogram. In this scheme, the relationship between the absorbed dose of radiation D and the dose equivalent H is, therefore, given by H = QND. Both Q and N are stipulated by the International Commission on Radiological Protection. Also known as the relative biological efficiency, Q depends on the nature of the radiation and has a value of one for x rays, gamma rays, and beta particles; 10 for neutrons; and 20 for alpha particles. N is a factor that takes into account the distribution of energy throughout the dose. One Sv is equal to 100 rem. ( NCI )] (UMLS (NCI) C0560132) =Quantitative Concept =UnitOfMeasureAtomInsens;
UnitOfMeasureAtomSens |
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