☢️ Nuclear Physics & Radioisotopes
Radioactive Activity (Becquerel vs Curie) Converter
Convert nuclear disintegration rate ($A = \lambda N$) between Becquerels ($\text{Bq}$), Curies ($\text{Ci}$), Millicuries ($\text{mCi}$), Microcuries ($\mu\text{Ci}$), and Gigabecquerels ($\text{GBq}$).
👤 Human Body K-40 (4.4 kBq)
🚨 Smoke Detector (0.9 µCi)
🏥 PET Scan F-18 (10 mCi)
🧪 1g Radium-226 (1 Ci)
Input Radioactivity Value
Standard SI Activity (Becquerels)
370.0 MBq
Megabecquerels
370.0 MBq
Microcuries
10,000 µCi
Rutherfords
370.0 rd
💡 Activity Equivalence:
$$1\text{ Curie (Ci)} = 37\text{ GBq} = 3.7 \times 10^{10}\text{ Bq} \implies 1\text{ mCi} = 37\text{ MBq} \implies 1\text{ }\mu\text{Ci} = 37\text{ kBq}$$
Understanding Radioactive Activity ($A$)
Radioactive activity ($A$) is the number of atomic nuclear disintegrations occurring in a radioisotope sample per unit time:
- Decay Law: $$A(t) = \lambda N(t) = \frac{\ln 2}{t_{1/2}} N(t)$$
- SI Unit (Becquerel): $1\text{ Bq} = 1\text{ decay per second}$.
- Curie (Ci): Defined historically by Marie Curie as the decay rate of 1 gram of Radium-226: exactly $3.7 \times 10^{10}\text{ Bq}$ ($37\text{ GBq}$).