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.
If you compare states, the highest incomes are in Massachusetts, New York State, District Of Columbia (DC), and California all exceeding $82,000 per annual. Employees in Texas receive about $77,500. Average incomes in Florida are $75,000. Average salaries in Michigan and Pennsylvania are $73,000 per annual. By far most paid US city is San Francisco, with average salary about $100,000 per annual. The second largest salaries are in New York City, Washington DC, and Boston, all from $87,000 to $88,000 per annual.