Why is alpha radiation the least penetrating? What are gamma rays used for? Explain how (i) ultra-violet radiation and (ii) radio waves are generated. Explain how the principles of radiation safety are applied to radiation therapy. How are radioactive isotopes used in science?
Woodcare and maintenance are the keys to having a long-lasting deck. Every year or two, a deck should be cleaned and stained to protect the wood from the harsh elements. UV rays and unwanted moisture can wreak havoc on an unprotected deck. The number one reason a deck stain fails is th...
Bursitis.Bursitis happens when bursae, small fluid-filled sacs, become irritated and inflamed. Of the 3 most common joints where this occurs, 2 are in the arm: the elbow and shoulder. Elbow bursitis can be caused by trauma, conditions like arthritis, or leaning on your elbow for extended pe...