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.
99.9 %. As you can see, you must be making $750,000 (three-fourths of one million dollars) each year to be ranked in the top 1%. So if you are one of those who think they rank in the top 1%, this may come as a surprise to you. To find out exactly where you fall in the income percentile, use the calculator.