Backscatter scanners use very low-dose X-rays. A dose of radiation can be expressed in microsieverts. It takes about 500,000 microsieverts to harm a developing baby. Backscatter units result in a radiation exposure of less than 1 microsieverts, which is far too low to cause damage to you or your child.
SBA 504 Loan. The US Small Business Administration 504 Loan or Certified Development Company program is designed to provide financing for the purchase of fixed assets, which usually means real estate, buildings and machinery, at below market rates.
TBA (meaning to be announced) is also used to describe a specific type of simple mortgage investment, the forward mortgage-backed security. This is used to indicate that the investor is acquiring some portion of a pending pool of as-yet unspecified mortgages, which will be specified at a given delivery date.