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.
US Average Weekly Earnings is at a current level of 865.61, down from 868.46 last month and up from 846.98 one year ago. This is a change of -0.33% from last month and 2.20% from one year ago.1  Category: Hours and Wages. 2  Region: United States.3  Report: Employment Situation.4  Source: Bureau of Labor Statistics.S Average Weekly Earnings is at a current level of 865.61, down from 868.46 last month and up from 846.98 one year ago. This is a change of -0.33% from last month and 2.20% from one year ago.