Calcolatore Energia di Legame per Nucleone
Calcola l'energia di legame media per nucleone di un nucleo atomico.
Attivita
192,540,883,488.874 Bq
Activity vs Number of Radioactive Atoms (N)
Formula
## Radioactive Activity Activity is the rate of radioactive disintegrations per second. One Becquerel (Bq) equals one disintegration per second. ### Formula **A = lambda × N = (ln2 / t½) × N** where lambda is the decay constant and N is the number of radioactive atoms. The older unit Curie: 1 Ci = 3.7 × 10¹⁰ Bq (the activity of 1 gram of Ra-226).
Esempio Risolto
10¹⁵ atoms of an isotope with half-life 3600 seconds (1 hour).
- 01lambda = ln(2) / 3600 = 1.925 × 10⁻⁴ s⁻¹
- 02A = 1.925 × 10⁻⁴ × 10¹⁵ = 1.925 × 10¹¹ Bq
- 03A = 1.925 × 10¹¹ / 3.7 × 10¹⁰ = 5.20 Ci
Domande Frequenti
What is the practical difference between Bq and Ci?
Bq is the SI unit (1 disintegration/second). Ci is the traditional unit (3.7 × 10¹⁰ Bq). Medical doses are often in MBq or mCi. Environmental levels are in Bq/kg or pCi/L.
How many atoms are in 1 Ci of a substance?
N = A / lambda = 3.7 × 10¹⁰ × t½ / ln(2). For Tc-99m (t½ = 6h): N = 3.7 × 10¹⁰ × 21600 / 0.693 = 1.15 × 10¹⁵ atoms, which is about 0.2 nanograms.
Does specific activity depend on isotope?
Yes. Specific activity (Bq/g) = lambda × NA / M, where NA is Avogadro number and M is atomic mass. Short-lived isotopes have enormous specific activity. Carrier-free isotopes have the maximum specific activity.
Impara