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.
The report titled The Big Payoff: Educational Attainment and Synthetic Estimates of Work-Life Earnings (.pdf) reveals that over an adult's working life, high school graduates can expect, on average, to earn $1.2 million; those with a bachelor's degree, $2.1 million; and people with a master's degree, $2.5 million. Over a work life, earnings for a worker with a bachelor's degree compared with one who had just a high school diploma increase by about $1 million for non-Hispanic Whites and about $700,000 for African Americans; Asians and Pacific Islanders; and Hispanics.