Noun
one millionth (1/1,000,000) gram
Source: WordNetAt the time of the Manhattan Project in 1944, the "tolerance dose" for workers was set at 0.1 microgram of ingested radium. citation citation Some of the biological effects of radium were apparent from the start. Source: Internet
By mass, polonium-210 is around 250,000 times more toxic than hydrogen cyanide (the LD 50 for 210 Po is less than 1 microgram for an average adult (see below) compared with about 250 milligrams for hydrogen cyanide citation ). Source: Internet
A typical self-luminous watch that uses radium paint contains around 1 microgram of radium. Source: Internet
Due to the controversy surrounding thimerosal it has been removed from most vaccines except multi-use influenza, where it was reduced to levels so that a single dose contained less than 1 microgram of mercury, a level similar to eating 10g of canned tuna. Source: Internet
For salmon, the optimal concentration of selenium is about 1 microgram selenium per gram of whole body weight. Source: Internet
It forms colorless cubic crystals, which were first characterized from microgram samples sized about 30 nanometers. Source: Internet