What does a PET scan use to create images?

A sample is 100% radioactive after it is prepared.  What is the sample’s radioactivity after 2 half-lives have elapsed?

How many electrons are contained in a −2.0 C charge? The charge on an electron is -1.6 x 10⁻¹⁹ C.

A sample is 100% radioactive after it is prepared.  What is the sample’s radioactivity after 4 half-lives have elapsed?

Manage diabetes mellitus. In some cases, injecting insulin is necessary. In others, tablets can be given to stimulate the body to release its own insulin.

True or False: the conjugate acid of F- is HF.

Prevent thromboembolic (clots that move) events, such as a stroke (cerebrovascular accident ) or heart attack: 

Which of the following type of emitted radiation is massless and does not carry a charge?

A sample is 100% radioactive after it is prepared.  What is the sample’s radioactivity after 3 half-lives have elapsed?

Which of the following type of emitted radiation is a negatively-charged particle with a negligible mass?