1 0:48 Pocahontas Trailer Pocahontas When English settlers land on the shores of her village, a free-spirited girl wonders what history-changing adventures await.
The gray (Gy), which is the SI unit of absorbed dose, corresponds to the absorption of 1 J of energy per kilogram of tissue. The rad (radiation absorbed dose) corresponds to the absorption of 1 10â2 J of energy per kilogram of tissue. Thus, 1 Gy = 100 rads. The rad is the unit most often used in medicine.
1 Below that, in the stratosphere, ozone absorbs nearly all the ultraviolet radiation (between 200 and 310 nm).  In the lowest region of the atmosphere, the troposphere, colored molecules absorb some visible light and other molecules (H2O, CO2) absorb infrared or heat energy.