Radioactivity & Radiation Converter - Educational Tools & Space Weather Data

From

Common Radioactivity Levels

1 Ci = 3.7×10¹⁰ Bq

Basic conversion

15 pCi = 0.555 Bq

Background radiation level

100 mCi = 3.7 GBq

Medical isotope dose

4 pCi/L = 148 Bq/m³

EPA radon action level

From

Absorbed Dose Examples

1 Gy = 100 rad

Basic conversion

0.01 mGy = 10 μGy

Chest X-ray dose

7 mGy = 0.7 rad

CT scan dose

2 Gy = 200 rad

Radiation therapy fraction

🔬 Nuclear Physics & Radioactive Decay

Fundamental Decay Law

Radioactive decay follows an exponential law where the number of unstable nuclei decreases over time according to their decay constant λ (lambda).

N(t) = N₀ × e^(-λt)

t₁/₂ = ln(2)/λ = 0.693/λ

Where N₀ is initial activity, λ is decay constant, and t₁/₂ is half-life.

Interactive Decay Visualization

Click buttons to see different decay scenarios

Explore how different isotopes decay at different rates

📚 History of Nuclear Discovery

1896

Henri Becquerel discovers radioactivity in uranium salts

1898

Marie & Pierre Curie discover radium and polonium

1902

Ernest Rutherford identifies alpha and beta radiation

1911

Rutherford discovers atomic nucleus structure

1932

James Chadwick discovers the neutron

1938

Otto Hahn discovers nuclear fission

🧪 Common Radioisotope Database

Carbon-14

Half-life: 5,730 years
Decay: β⁻ → Nitrogen-14
Use: Radiocarbon dating

Iodine-131

Half-life: 8.02 days
Decay: β⁻ → Xenon-131
Use: Thyroid treatment

Cobalt-60

Half-life: 5.27 years
Decay: β⁻ → Nickel-60
Use: Cancer therapy

Uranium-238

Half-life: 4.47 billion years
Decay: α → Thorium-234
Use: Nuclear fuel

Technetium-99m

Half-life: 6.01 hours
Decay: γ → Technetium-99
Use: Medical imaging

Radon-222

Half-life: 3.82 days
Decay: α → Polonium-218
Use: Natural background

🏥

Medical Applications

Imaging, therapy, sterilization

⚡

Nuclear Power

Energy generation, propulsion

🔬

Research

Tracers, dating, analysis

🏭

Industrial

Testing, gauging, irradiation

🛡️

Defense

Detection, weapons, security

🌍

Environmental

Monitoring, cleanup, tracking

❓ Frequently Asked Questions

What is radioactivity?

Radioactivity is the spontaneous decay of unstable atomic nuclei, emitting radiation in the form of alpha particles, beta particles, gamma rays, or neutrons. It follows an exponential decay law: N(t) = N₀ × e^(-λt).

What is a half-life?

Half-life is the time required for half of a radioactive sample to decay. It's related to the decay constant by t₁/₂ = ln(2)/λ = 0.693/λ. Each isotope has a characteristic half-life ranging from microseconds to billions of years.

How can I stay safe around radiation?

Radiation safety follows the ALARA principle (As Low As Reasonably Achievable) using Time, Distance, and Shielding. Minimize exposure time, maximize distance (inverse square law), and use appropriate shielding materials.

What are the main types of nuclear decay?

Nuclear decay occurs when unstable nuclei release energy to reach a more stable state. Common types include alpha decay (helium nucleus), beta decay (electron/positron), and gamma decay (electromagnetic radiation).

Which materials shield against each type of radiation?

Alpha: stopped by paper/skin.
Beta: stopped by aluminum/plastic.
Gamma: reduced by lead/concrete.
Neutrons: moderated by hydrogen-rich materials like water or polyethylene.

Material choice depends on radiation type and energy.

📊 Quick Reference

Key Constants

Ci = 3.7×10¹⁰ Bq
Gy = 100 rad
Sv = 100 rem

Decay Formula

N(t) = N₀ × e^(-λt)
t₁/₂ = 0.693/λ
A(t) = λ × N(t)

Safety Limits

Worker: 20 mSv/year

Public: 1 mSv/year

Background: 2.4 mSv/year

🧮 Advanced Calculators

Decay Calculator

Shielding Calculator

🛡️ Safety Protocols

ALARA Principle As Low As Reasonably Achievable

Time Minimize exposure time

Distance Inverse square law

Shielding Use appropriate materials

Monitoring Regular dose assessment

Training Ongoing education

☢️ Radiation Types

α Alpha Paper stops

β Beta Aluminum stops

γ Gamma Lead reduces

n Neutron Water moderates

☢️ Radioactivity & Radiation Converter