7. The more penetrating (longer travel distance) the more dangerous a radiation is. According to the following Table, which radiation is the most dangerous and needs the most protection? TABLE 9.3 Properties of lonizing Radiation and Shielding Required Property Characteristics Symbols Travel distance in air Tissue depth Shielding Typical source Alpha Beta Helium nucleus Electron B.-le 200-300 cm 2-4 cm 0.05 mm Paper, clothing Radium-226 4-5 mm Heavy clothing. lab coats, gloves, Carbon-14 Gamma High-energy rays 500 m 50 cm or more Lead, thick concrete Technetium-99m

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Chapter1: Chemical Foundations
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7. The more penetrating (longer travel distance) the more dangerous a radiation is. According to
the following Table, which radiation is the most dangerous and needs the most protection?
TABLE 9.3
Properties of lonizing Radiation and Shielding Required
Beta
Electron
B.-fe
200-300 cm
4-5 mm
Heavy clothing.
Property
Characteristics
Symbols
Travel distance in air
Tissue depth
Shielding
Typical source
Alpha
Helium nucleus
2-4 cm
0.05 mm
Paper,clothing
Radium-226
lab coats, gloves,
Carbon-14
Gamma
High-energy rays
500 m
50 cm or more
Lead, thick concrete
Technetium-99m
2
Transcribed Image Text:7. The more penetrating (longer travel distance) the more dangerous a radiation is. According to the following Table, which radiation is the most dangerous and needs the most protection? TABLE 9.3 Properties of lonizing Radiation and Shielding Required Beta Electron B.-fe 200-300 cm 4-5 mm Heavy clothing. Property Characteristics Symbols Travel distance in air Tissue depth Shielding Typical source Alpha Helium nucleus 2-4 cm 0.05 mm Paper,clothing Radium-226 lab coats, gloves, Carbon-14 Gamma High-energy rays 500 m 50 cm or more Lead, thick concrete Technetium-99m 2
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