beta particles and gamma rays as it decays. This half life is long enough for it to be transported form where it is produced to where it needs to be used but it is also short enough to minimise patients exposure to radiation It decays into non-radioactive gas‚ Xenon 131‚ which can easily escape without interfering bodily functions Beta particles can destroy abnormal tissue. Gamma rays allow external imaging to ensure target has been reached Question 19 (7 marks) Name ONE type of cell‚ other than
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technique that uses the natural decay rate of unstable isotopes found in materials in order to calculate the age of that material. (Done to calculate actual age of Fossil) c. Isotopes are atoms of an element that have the same number of protons‚ but a different number of neutrons. Isotopes are named by their number of protons plus their number of
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Name: Cayla Klimach Date: 2/13/15 Student Exploration: Element Builder Vocabulary: atom‚ atomic number‚ electron‚ electron dot diagram‚ element‚ energy level‚ ion‚ isotope‚ mass number‚ neutron‚ nucleus‚ periodic table‚ proton‚ radioactive‚ valence electrons Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. What are some of the different substances that make up a pizza? :Cheese‚ tomato sauce‚ meat 2. What substances make up water? Hydrogen & Oxygen (H2O) 3. What substances
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ENERGY AND ENVIRONMENT Part II: Energy and Essential Resources Chapter 5: Nuclear Power 1. 2. 3. 4. 5. 6. Working principle Nuclear reactors Detection and safety issues Radioactive wastes treatment Comparison to other powers Possible alternatives 1 Do you know? 2 Mass & Atomic Numbers Isotopes All of the following are possible sources of radiation except a. background radiation from the Earth’s crust. b. nuclear waste. c. medical & dental X-rays. d. distilled water
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Radioisotopes are radioactive isotopes of an element. An isotope is an element’s atom that has the same number of protons and electrons‚ but a different number of neutrons‚ causing the atom to be unstable. With radioisotopes‚ they can occur naturally‚ but most often are formed artificially by altering the atom. Scientists measure the rate of which radioisotopes decay at by using the term half-life. This refers to when one-half of the radioactive material has decayed. When the word radioactive comes into
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slow radioactive decay provides the main source of heat inside the Earth‚ causing convection and continental drift. •The
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will try to present some of beneficial applications of radioactivity. • Probably the most significant usage of radioactivity is in medicine. It is used in diagnostic scintigraphy‚ which is a study to asses organ function. Most frequently used‚ isotope of technetium-99m allows the quick removal of the radioisotope from the body and minimizes the risk of possible complications. Unlike X-ray studies‚ which better illustrates the structure of the organ‚ scintigraphy allows accurate diagnosis of its
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Telling Geologic Time Putting it in perspective Determining geological ages • Relative age dates – placing rocks and events in their proper sequence of formation • Numerical dates – specifying the actual number of years that have passed since an event occurred (known as absolute age dating) Figure 1-15 (p. 16) Geologic Time Scale. Uniformitarianism The physical‚ biological and chemical principles acting on the Earth in the present also acted on the Earth in the past
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Iodine Isotopes are the atoms that have in their nucleus an atomic number corresponding to the chemical behavior of that element. Since isotopes have the same number of protons‚ they all have identical chemical behavior. But‚ however‚ since their neutron numbers are different the isotopes of the same element may have different radioactivity. An isotope that is radioactive is called a radioisotope like iodine‚ which is important in our health. In radioactivity‚ the nucleus of an unstable isotope or element
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example of how radioactive decay works‚ the TA may lead a small demonstration. Each student will receive one penny and stand up. At this point all of the students are parent isotopes. Every student should then flip their penny. Students whose penny lands heads-up should sit down. These students who are now seated are now daughter isotopes. The remaining standing students should again flip their penny‚ and students whose penny lands heads-up should sit down to become daughter isotopes. a. How many
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