How to Calculate Radioactive Activity Rate (A = λN)
Calculate nuclear disintegration rate step-by-step:
STEP 01
Enter Sample Mass
Input radioisotope mass in grams.
STEP 02
Count Radioactive Atoms N
Multiply moles by Avogadro's number N = (mass / MW) × 6.022×10²³.
STEP 03
Compute λ in s⁻¹
Divide decay constant λ = ln(2) / half-life in seconds.
STEP 04
Compute Activity Rate
Multiply A = λ × N for Becquerels (1 Bq = 1 dps) and Curies (1 Ci = 3.7×10¹⁰ Bq).
Key Features & Radiation Physics
Disintegration Rate Engine
Computes instantaneous disintegrations per second (dps).
Becquerel & Curie Converter
Converts SI Becquerels (Bq) to traditional Curie (Ci) radiation units.
Nuclear Medicine Dosing
Essential for radiopharmaceutical dosage calibration.
Nuclear Physics Guide: Radioactivity Activity Rate
The Activity (A) of a radioactive sample is the number of disintegrations per unit time:A = λ · N = [ln(2) / t½] · [(m / M) · NA]
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Frequently Asked Questions
?What is the difference between a Becquerel and a Curie?
1 Becquerel (Bq) = 1 decay per second. 1 Curie (Ci) = 3.7 × 10¹⁰ decays per second (the activity of 1 gram of Radium-226).