Which mnemonic corresponds to Activity?

Which mnemonic corresponds to Activity?

• A. CBAM
• B. BEAM
• C. LAMP
• D. DASH

Answer: (A)

Activity is the rate at which radioactive nuclei decay, i.e., the number of disintegrations per unit time. The mnemonic CBAM is the one used here to help you recall this concept, because it cues the idea of counting events per time—the essence of a rate. In practice, Activity is measured in decays per second (Becquerels) and relates to how many nuclei are decaying each moment, described by A = dN/dt = λN. A higher Activity means more decays per second, while Activity decreases as nuclei decay away, following the half-life. The other mnemonics don’t align with this idea of a decay rate, which is why CBAM is the best fit for recalling Activity.

Activity is the rate at which radioactive nuclei decay, i.e., the number of disintegrations per unit time. The mnemonic CBAM is the one used here to help you recall this concept, because it cues the idea of counting events per time—the essence of a rate. In practice, Activity is measured in decays per second (Becquerels) and relates to how many nuclei are decaying each moment, described by A = dN/dt = λN. A higher Activity means more decays per second, while Activity decreases as nuclei decay away, following the half-life. The other mnemonics don’t align with this idea of a decay rate, which is why CBAM is the best fit for recalling Activity.