Nuclear Engineering / Subcategory
Radiation
Radiation calculators and formulas for radioactive decay and half-life. Includes decay constant, activity, and remaining mass calculations for radioactive isotopes.
8Formulas
All levels Difficulty
Updated Oct 2026
← All Nuclear Engineering (85) Radiation (8)
Fundamental
Secular Equilibrium Activity Ratio
A_daughter = A_parent (at secular equilibrium)
Fundamental
Absorbed Dose Rate
Ḋ = D / t
Fundamental
Radiation Dose Equivalent (Sievert)
H = D * WR
Fundamental
Curie to Becquerel Conversion
A(Bq) = A(Ci) * 3.7 * 10^10
Fundamental
Specific Activity
SA = A / m = (λ * NA) / M
Fundamental
Radioactive Activity
A = λ * N
Fundamental
Half-Life Relation
t₁/₂ = ln2 / λ
Fundamental
Radioactive Decay Law
N = N₀e^(−λt)