You may need a backup method of birth control if you have vaginal intercourse during the seven days after a missed pill. Some backup methods are the condom, female condom, diaphragm, or sponge. You can also use emergency contraception (morning after pill) up to five days after unprotected intercourse.
Strontium-90, a radioactive isotope, is a by-product of nuclear reactors and present in nuclear fallout. It has a half-life of 28 years. It is absorbed by bone tissue instead of calcium and can destroy bone marrow and cause cancer. However, it is also useful as it is one of the best high-energy beta-emitters known. It can be used to generate electricity for space vehicles, remote weather stations and navigation buoys.
Strontium chloride (Sr-89), initially FDA-approved in 1993, is used as a paliative therapeutic option to help relieve the pain from bone metastases. Strontium chloride is mainly used in cases of metastatic castrate-resistant prostate cancer.[A31264] Bone metastases is a common and severe complication presented in advanced stages of the disease. It is usually presented mainly in patients with prostatic and breast cancer, as well as in cancer of lung, bladder and thyroid.