Radiation Protection

Practical tools to calculate shielding thickness, safe distance, and exposure time to minimise radiation doses. Based on ALARA and ICRP guidelines. Essential for nuclear workers, medical staff, and safety officers.

10Formulas

All levels Difficulty

Updated Jul 2026

← All Nuclear Engineering (96) Radiation Protection (10)

Fundamental

Radiation Weighting Factor

w_R = 1 for photons, 2 for protons, 5 for neutrons, 20 for alpha

Fundamental

ALARA Radiation Calculator

No single formula; principle of optimisation

Fundamental

Occupational Radiation Dose Limit

L = min(50 mSv, 20 mSv over 5 years)

Fundamental

Annual Radiation Exposure

E_annual = Σ (D_i × t_i)

Fundamental

Radiation Safety Distance Calculator

d = sqrt( (A × Γ) / (D_rate_limit) )

Fundamental

Radiation Exposure Time Calculator

t = (D_limit - D_bg) / D_rate

Fundamental

Radiation Dose Reduction

DR = 1 - (I/I₀)

Fundamental

Lead Shield Thickness

x = ln(I₀/I) / μ

Fundamental

Neutron Shielding Thickness

φ = φ₀ e^{-Σ x}

Fundamental

Gamma Shielding Thickness

I = I₀ e^{-μx}