Domanda del libro di testo
The dosage of technetium-99m for a lung scan is 20. µCi/kg of body mass. How many millicuries of technetium-99m should be given to a 50.0-kg person (1 mCi = 1000 µCi)
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Ch.5 Nuclear Chemistry
Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353
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TOC.tableOfContents
- Ch.1 Chemistry in Our Lives11
- Ch.2 Chemistry and Measurements80
- Ch.3 Matter and Energy54
- Ch.4 Atoms and Elements51
- Ch.5 Nuclear Chemistry42
- Ch.6 Ionic and Molecular Compounds57
- Ch.7 Chemical Quantities and Reactions41
- Ch.8 Gases29
- Ch.9 Solutions51
- Ch.10 Acids and Bases and Equilibrium65
- Ch.11 Introduction to Organic Chemistry: Hydrocarbons78
- Ch.12 Alcohols, Thiols, Ethers, Aldehydes, and Ketones83
- Ch.13 Carbohydrates54
- Ch.14 Carboxylic Acids, Esters, Amines, and Amides90
- Ch.15 Lipids61
- Ch.16 Amino Acids, Proteins, and Enzymes84
- Ch.17 Nucleic Acids and Protein Synthesis83
- Ch.18 Metabolic Pathways and ATP Production67
Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353Non è quello che usi tu?Cambia libro di testo
Capitolo 5, Problema 26
Two samples of a radioisotope were spilled in a nuclear laboratory. The activity of one sample was 8 kBq and the other 15 mCi. Which sample produced the higher amount of radiation?
Guida verificata passo dopo passo1
Understand the problem: The activity of the two samples is given in different units (kBq and mCi). To compare them, we need to convert both activities into the same unit.
Recall the unit conversion factors: 1 Ci (Curie) = 3.7 × 10^10 Bq (Becquerel). Therefore, 1 mCi (millicurie) = 3.7 × 10^7 Bq.
Convert the activity of the second sample from mCi to Bq using the formula: \( \text{Activity in Bq} = \text{Activity in mCi} imes 3.7 imes 10^7 \). Substitute 15 mCi into the formula.
Compare the activity of the first sample (8 kBq, which is \( 8 imes 10^3 \) Bq) with the converted activity of the second sample in Bq.
Determine which sample has the higher activity based on the comparison of the two values in Bq.
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Radioactivity
Radioactivity is the process by which unstable atomic nuclei lose energy by emitting radiation. This can occur in the form of alpha particles, beta particles, or gamma rays. The rate of decay is measured in terms of activity, which indicates how many disintegrations occur per unit time, typically expressed in becquerels (Bq) or curies (Ci). Understanding radioactivity is essential for comparing the radiation emitted by different samples.
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Percorso guidato
02:52
Measuring Radioactivity Concept 1
Units of Measurement
Radioactivity is measured in various units, with the becquerel (Bq) and curie (Ci) being the most common. One becquerel corresponds to one disintegration per second, while one curie is equivalent to 37 billion disintegrations per second. To compare the activity of the two samples effectively, it is crucial to convert them into the same unit, allowing for a direct comparison of their radiation output.
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Percorso guidato
02:52Measuring Radioactivity Concept 1
Radiation Dose
Radiation dose refers to the amount of radiation energy absorbed by a material or biological tissue. It is important to understand that higher activity levels in radioisotopes can lead to greater radiation doses, which can have significant health implications. By analyzing the activity of the samples, one can determine which sample poses a greater risk in terms of radiation exposure.
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Percorso guidato
02:29Intro to Radioactivity
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