Th e same trends hold for other radiosensitivity parameters, e.g. RBE can also be predicted as: RBE predicted=D 10%,x-rays/D 10%,protons,predicted. 1D).This allows a cell's D 10%,protons to be expressed as a function of the cell's D 10%,x-rays, the dose-weighted LET, and three free parameters, c, f and g as follows: D 10%,protons=c*exp(-f*LET)*D 10%,x-rays+g. 1A-C), and that the slope of this correlation varies exponentially with dose-weighted LET (Fig. We observed that cell radiosensitivity to protons, defined by the dose required to achieve 10% survival, D 10%,protons, is strongly linearly correlated with D 10%,x-rays (r=0.9728-0.9889) (Fig. Methods: We performed clonogenic assays to characterize the survival of human cancer cell lines (n=8-11) exposed to 6 MV x-rays and protons with dose-weighted LETs of 1.2, 2.6 and 9.9 keV/μm. Purpose: To show that the linear correlation between ion and photon radiosensitivity can be used to model proton RBE. The silver calculated at $18/oz and gold at $1350/oz market for Jan 2018.1UT MD Anderson Cancer Center, Radiation Physics, Houston, USA 2UT MD Anderson Cancer Center, Radiation Oncology, Houston, USA * prices for raw metal, prices change everyday. How to find: Will be stamped the same way as solid gold. It may be described as hollow, tubed, semi-solid, etc. law, companies should disclose when a jewelry piece made of hollow gold. Hollow gold is used to make jewelry both lighter and cheaper, and is very common with bangles and hoop earrings. Value: Hollow gold is still gold but with empty space inside the jewelry piece, so it still has the same value by weight. ![]() Solid gold can be any color - yellow, rose or white.Īll our rings, earrings, necklaces and bracelets are made from 14k solid gold that was reclaimed and as such, is sustainable and eco-friendly. How to find: Will be be stamped "10k" or "417", "14k" or "585", "18k" or "750", "24k" or "999." If the piece is stamped “18k 925” it means it is made of both 18k solid gold parts and solid silver parts. If you are not sure what kt means, here's a handy guide that explains the meaning behind 14k. ![]() Pure 24k metal cost is $43.40 per gram, 14k metal costs is $25.32 per gram.* Solid gold is the best metal for wearability and as an investment. How to find: Will be stamped "1/20 14k" (meaning 1/20 of total jewelry weight is 14k gold), can also have company name/logo stamped. ![]() Great to wear (the gold will never wear off!) but bad as an investment (has low re-sale value). law, the plating needs to be very very thick (at least 5% of jewelry total weight). Value: Has 5% of the value of solid gold. ![]() How to find: Will be stamped "925" or "sterling," can also have company name/logo stamped. The gold plating will wear off with time, but the silver underneath will not tarnish or cause skin discoloration for most people. Sterling silver is a sought-after material ($0.57 per gram*) while still being very affordable compared to gold ($43.40 per gram*). Value: Still gold plated metal, but with valuable sterling silver. How to find: Will have no quality mark on the jewelry, but may have company name/logo stamped. Cheaper jewelry will have a very thin plating which wears off fast, but some higher quality brands will have a thicker plating with an additional protective coating to help it last longer. Contains real gold, but very little (about one gram of real gold in one pint of solution can be used to plate thousands of pieces!).
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