If an invite says black tie optional, err on the side of caution and wear a long dress or dark suit or tux. Like your mom always said, it's better to be safe than sorry. what to wear to a winter wedding. what to wear to a fall wedding. what to wear to a summer wedding. what to wear to a spring wedding.
In the SI system, a millisievert (mSv) is defined as the average accumulated background radiation dose to an individual for 1 year, exclusive of radon, in the United States. 1 mSv is the dose produced by exposure to 1 milligray (mG) of radiation.
The actual exposure received depends upon the dose rate and the exposure time. As the Sievert is a very large unit, effective radiation exposure is normally expressed in milliSieverts. A milliSievert (mSv) is one thousandth of a Sievert (1/1,000).