Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

9Sci CH24

9th Science CH24 Radioactivity and Nuclear Reactions

alpha particle a particle of nuclear radiation emitted from a decaying atomic nucleus; has a charge of 2+, an atomic mass of 4, and is the largest, slowest, and least penetrating form of radiation
beta particle a negatively charged electron or positively charged positron emitted from a decaying atomic nucleus; beta particles are faster moving and more penetrating than alpha particles
bubble chamber device filled with super-heated liquid; used to detect and monitor the path of charged nuclear particles, which leave a trail of bubbles as they pass through the chamber
chain reaction a continuing series of fission reactions in which neutrons from fissioning nuclei cause other nuclei to split, releasing more neutrons, which split more nuclei, and so on
cloud chamber device filled with water- or ethanol- saturated air; used to detect charged nuclear particles which leave a trail as they pass through
gamma ray high-frequency electromagnetic waves that travel at the speed of light, have no mass or charge, and are the most penetrating form of radiation
half-life the amount of time required for one-half of the nuclides in a sample of radioactive isotope to decay
nuclear fission process in which an atom’s nucleus is split into two nuclei with smaller masses
nuclear fusion process in which two atomic nuclei with low masses are fused into a single nucleus of larger mass; also known as a thermonuclear reaction
nuclide the nucleus of a specific isotope having a certain specific atomic number and atomic mass
PET Positron-Emission Tomography; PET scans are used in medicine to reveal brain function and certain brain disorders such as tumors
radioactivity the emission of high-energy radiation or particles from the nucleus of a radioactive atom
tracer a radioisotope used in medical diagnosis to allow doctors to monitor human body functions, locate tumors, detect fluid movement, and so on
transmutation changing one element to another through radioactive decay