Saturday, February 21, 2015

Mass surveillance

1 comment:

  1. I wonder how safe this is to people?

    At least to my knowledge:

    X-rays doses are measured in millisieverts (mSv). According to federal occupational limits, the maximum mSv a person can be safely exposed to is approximately 50 mSv per year.

    Every time someone passes through an airport scanner it is 0.0001 mSv.

    Flying from New York to Los Angeles is 0.1 mSv.

    A hospital chest x-ray is also 0.1 mSv.

    Living at sea level for a year is 3 mSv.

    Living at a high altitude place (e.g. Denver) for a year is 5 mSv.

    A single CT scan is 10 mSv.