As of January 27, 2013, Parcel Select was split into Parcel Select, for online purchasing, and Standard Post for purchasing at the Post Office. Parcel Select is significantly cheaper than Standard Post. Parcel Select ships at the same speed as First Class mail.
Wiktionary (0.00 / 0 votes) Rate this definition: dosimeter (Noun). A device used to measure a dose of ionising radiation. These normally take the form of either Optically Stimulated Luminescence (OSL), photographic film, thermoluminescent devices (TLD) or electronic personal dosimeters (PDM).
M TOT VIS: Total visual magnification of the microscope If in the above equation the total visual magnification is replaced by the relationship of useful magnification (M TOT VIS = 500 to 1,000 x NA), it can be seen that, to a first approximation, the depth of field is inversely proportional to the square of the numerical aperture.