Beta-plus (Î² +) radiation is the emission of positrons, which are the antimatter form of electrons. When a positron slows to speeds similar to those of electrons in the material, the positron will annihilate an electron, releasing two gamma photons of 511 keV in the process.
The Congressional Budget Office puts the cut-off lower, at $347,000 in 2007, or $252,000 after subtracting federal taxes and adding back transfers. Measured by net worth, rather than income, the top 1% started at $6.9m in 2009, according to the Federal Reserve, down 23% from 2007.
Women earned 76.5 cents for every dollar that men did last year, moving no closer to narrowing a gender pay gap that has barely budged in almost a decade. Male full-time workers notched median annual earnings of $49,398 in 2012, compared with $37,791 for female workers, according to a Census Bureau report Tuesday.