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Radioactivity
Radioactivity Definitions for LC
Question | Answer |
---|---|
Radioactivity | The spontaneous breaking up of unstable nuclei with the emission of one or more types of radiation |
What happens when an atom loses an alpha particle? | It changes into an atom of the element two places before it in the periodic table The mass number of the parent atom decreases by four |
The half-life of an element is | The time taken for half of the nuclei in any given sample to decay |
When an atom loses a beta particle? | It increases its atomic number by 1. The mass number stays the same. |
Name an Alpha source | Americium - 241 |
Name a Beta Source | Carbon - 14 |
Name a Gamma Source | Cobalt - 60 |
What is a Nuclear Reaction | Its a process that alters the composition, structure or energy of an atomic nucleus |
Polonium and Radium were discovered in 1898 by? | Marie and Pierre Curie |
The word "Radioactive" means? | Giving off of Rays |
An Alpha Particle consists of? | Two protons and Two Neutrons stuck together |
Alpha Particles Properties | Slow Moving Low Penetrating Power - few cms of air or a sheet of paper |
Beta Particle Properties | Fast Moving Electrons Lighter than Alpha Particles More penetrating than Alpha Particles - 5 mm of Aluminium |
Gamma Radiation Properties | High Energy Electromagnetic Radiation similar to X - Rays travelling at the speed of light. Not deflected by Electric or magnetic fields Very High Penetrating ability. Only stopped by thick slab of Lead Cancer Causing. Can be used to kill cancer. |
The changing of one element into another is known as? | Transmutation |
What is a Radioisotope | A Radioactive Isotope |
Radioisotope Medical Use | Kills Cancerous Cells = Radiotherapy Sterilising medical instruments Iodine - 131 used to study Thyroid gland |
Radioisotope Archaeological Use | Used for Carbon dating using a ratio of C - 12 to C - 14 (Radiocarbon Dating) |
Radioisotope Agricultural Use | Measuring the uptake of Phosphorus by Plants using P - 32 |
Radioisotope Food Irradiation Use | Kills disease carrying organisms. Herbs and Strawberries. Not suitable for all foods, e.g. Red Meat |
Radioisotope Smoke Alarms Use | Americium - 241 alpha particles are blocked by ash particles setting of |
Backround Radiation | Radiation in the environment coming from natural sources |
Radiation was discovered by? | Henri Becquerel |
Who discovered Polonium and Radium? | Marie and Pierre Curie |