slide 1 of 18 chemistry 25.4. © copyright pearson prentice hall slide 2 of 18 radiation in your...

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Chemistry 25.4

© Copyright Pearson Prentice Hall

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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.

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Radiation in Your Life >

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Detecting Radiation

Detecting Radiation

What are three devices used to detect radiation?

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Radiation in Your Life > Detecting Radiation

Ionizing radiation is radiation with enough energy to knock electrons off some atoms of the bombarded substance to produce ions.

Devices such as Geiger counters, scintillation counters, and film badges are commonly used to detect radiation.

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Radiation can produce ions, which can then be detected, or it can expose a photographic plate and produce images.

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Geiger Counter

A Geiger counter uses a gas-filled metal tube to detect radiation.

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Scintillation Counter

A scintillation counter uses a phosphor-coated surface to detect radiation.

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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.

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Radiation in Your Life >

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Using Radiation

Using Radiation

How are radioisotopes used in medicine?

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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.

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Radioisotopes can be used to diagnose medical problems and, in some cases, to treat diseases.

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This scanned image of a thyroid gland shows where radioactive iodine-131 has been absorbed.

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Section Quiz

-or-Continue to: Launch:

Assess students’ understanding of the concepts in Section

25.4 Section Quiz.

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25.4 Section Quiz.

1. Ionizing radiation can remove _______ from atoms.

a. protons

b. neutrons

c. positrons

d. electrons.


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25.4 Section Quiz.

2. Which of the following is NOT a device used to detect radiation?

a. geiger counter

b. scintillation counter

c. film badge

d. radioisotope


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25.4 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.

a. are more susceptible to damage because they grow faster

b. absorb more radiation because they are larger

c. grow slower

d. are smaller


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25.4 Section Quiz.

4. How do scientists detect thyroid problems?

a. with teletherapy

b. by neutron activation analysis

c. using an iodine-131 tracer

d. using a radioisotope sealed in a gold tube


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Radiation in Your Life > Concept Map

Concept Map 25. Solve the Concept Map with the help of an interactive guided tutorial.

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