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.
All of the high-energy X-rays are absorbed by our atmosphere well above our heads, which is very fortunate for us indeed! Likewise, most of the UV radiation (especially the highest energy, shortest wavelength regions of the UV spectrum) is blocked by the thermosphere, mesosphere, and stratosphere.