Radioactivity
dpmtoµCi
Convert disintegrations per minute (dpm) to microcuries (µCi).
Factor1 dpm = 4.504505e-7 µCi
Converter
dpm
Accepts numbers or expressions, e.g. 150 + 14.7
Result
µCi
Rendered to 6 significant figures.
Formula
Formula
µCi = dpm × 4.504505e-7
Multiply any value in disintegrations per minute by 4.504505e-7 to obtain the value in microcuries.
Worked example
Convert 1e+7 dpm to µCi.
- 01Start with 1e+7 dpm.
- 02Multiply by the conversion factor: 1e+7 × 4.504505e-7 = 4.5045 µCi.
Result1e+7 dpm = 4.5045 µCi
Conversion table
| dpm | µCi |
|---|---|
| 1 | 4.5045e-7 |
| 2 | 9.009e-7 |
| 5 | 2.2523e-6 |
| 10 | 4.5045e-6 |
| 20 | 9.009e-6 |
| 50 | 2.2523e-5 |
| 100 | 4.5045e-5 |
| 200 | 9.009e-5 |
| 500 | 0.00022523 |
| 1000 | 0.00045045 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from dpm to µCi?
1 dpm equals 4.504505e-7 µCi. To convert, multiply the value in disintegrations per minute by 4.504505e-7.
How do I convert 1 dpm to µCi?
1 dpm = 4.5045e-7 µCi. For any value, multiply by 4.504505e-7.
How do I convert µCi back to dpm?
Divide by the same factor — or equivalently, multiply by 2220000. So 1 µCi = 2.22000e+6 dpm.
When would I need to convert disintegration per minute to microcurie?
Radioactivity (activity) conversions between dpm and µCi are routine in health physics, nuclear medicine ordering, environmental monitoring, radiopharmacy and reactor/accelerator-source documentation. The becquerel (Bq) is the SI unit; the curie (Ci) is the legacy unit (1 Ci ≡ 3.7×10¹⁰ Bq exactly). This category is strictly activity (decays per second) — it does NOT cover absorbed dose (Gy, rad), dose equivalent (Sv, rem), exposure or dose rate, all of which are different physical quantities and live in separate categories.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).