© Copyright Pearson Prentice Hall Slide 1 of 18 Radiation in Your Life In a smoke detector, radiation from the Americum nuclei ionizes the nitrogen and.

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© Copyright Pearson Prentice Hall Slide 1 of 18 Radiation in Your Life In a smoke detector, radiation from the Americum nuclei ionizes the nitrogen and oxygen in smoke-free air, allowing a current to flow. When smoke particles get in the way, a drop in current is detected by an electronic circuit, causing it to sound an alarm. You will learn about some of the other practical uses of radiation. 25.4

© Copyright Pearson Prentice Hall Radiation in Your Life > Slide 2 of 18 Detecting Radiation - three devices used to detect radiation 25.4

Slide 3 of 18 © Copyright Pearson Prentice Hall Radiation in Your Life > Detecting Radiation Geiger counters scintillation counters film badges are commonly used to detect radiation. 25.4

Slide 4 of 18 © Copyright Pearson Prentice Hall Radiation in Your Life > Detecting Radiation Radiation can produce ions which can then be detected, or it can expose a photographic plate and produce images. 25.4

Slide 5 of 18 © Copyright Pearson Prentice Hall Radiation in Your Life > Detecting Radiation Geiger Counter A Geiger counter uses a gas-filled metal tube to detect radiation. 25.4

Slide 6 of 18 © Copyright Pearson Prentice Hall Radiation in Your Life > Detecting Radiation Scintillation Counter A scintillation counter uses a phosphor-coated surface to detect radiation. 25.4

Slide 7 of 18 © Copyright Pearson Prentice Hall Radiation in Your Life > Detecting Radiation Film Badge A film badge consists of several layers of photographic film covered with black lightproof paper, all encased in a plastic or metal holder. 25.4

© Copyright Pearson Prentice Hall Radiation in Your Life > Slide 8 of 18 Using Radiation radioisotopes used in medicine, crime labs, and museums 25.4

Slide 9 of 18 © Copyright Pearson Prentice Hall Radiation in Your Life > Using Radiation Neutron activation analysis is a procedure used to detect trace amounts of elements in samples. Neutron activation analysis is used by museums to detect art forgeries, and by crime laboratories to analyze gunpowder residues. 25.4

© Copyright Pearson Prentice Hall Slide 10 of 18 Radiation in Your Life > Using Radiation Radioisotopes can be used to diagnose medical problems and, in some cases, to treat diseases. 25.4

Slide 11 of 18 © Copyright Pearson Prentice Hall Radiation in Your Life > Using Radiation This scanned image of a thyroid gland shows where radioactive iodine-131 has been absorbed. 25.4

© Copyright Pearson Prentice Hall Slide 12 of Section Quiz. 1. Ionizing radiation can remove _______ from atoms.

© Copyright Pearson Prentice Hall Slide 13 of Section Quiz. 2.Which of the following is NOT a device used to detect radiation?

© Copyright Pearson Prentice Hall Slide 14 of Section Quiz. 3.Choose the correct words for the space. When a tumor is treated by radiation, more cancer cells than normal cells are killed because cancer cells ____________ than normal cells.

© Copyright Pearson Prentice Hall Slide 15 of Section Quiz. 4.How do scientists detect thyroid problems?