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.
You might be surprised to learn that the top 20 percent of income earners bring in a household income of just over $100,000. The top 10 percent of earners have a household income of more than $148,687.To be considered in the top 1 percent, household income is at least $521,411.My friend Alexander Green of The Oxford Club brings these figures to his readersâ attention in â How to Know if Youâre Rich .â Iâve known Alex for years.arning enough income to be in the top 1, 10 or 20 percent is no small accomplishment, but chances are good that many people you know, and may not think of as rich, fall into the top 1, 10 or 20 percent.