Radioactive Sources (set of 5) - SN-7972A



The following sources are mounted in 2.5 cm diameter sealed plastic disks.

The sources are USNRC License Exempt (US only).  Outside the US, consult local laws and regulations.  

Shown below are the isotopes, activity, half-life and types of radiation (alpha-α, beta-β;, gamma-γ).


  • Po-210, 0.1 µCi, 138 days, alpha
  • Sr-90, 0.1 µCi, 28.6 years, beta
  • Tl-204, 0.25 µCi, 3.78 years, beta
  • Co-60, 1 µCi, 5.27 years, beta and gamma
  • Cs-137, 0.25 µCi, 30.2 years, beta and gamma


Included Sources

  • 0.1 µCi, 138 day half-life,α radiation
  • 0.1 µCi 28.6 year half-life, βradiation
  • 0.1 µCi, 3.78 year half-life, βradiation
  • 1 µCi, 5.27 year half-life, β,γradiation
  • 0.25 µCi, 30.2 years,β,γradiation
Stated Uncertainty
  • ± 15%


PASCO Radioactive Source Disclaimer - Please review prior to purchase

Before purchasing PASCO radioactive sources:

Local, national, and international regulations may restrict the purchase, storage, transport, use or disposal of radioactive sources.  Please  consult your local regulations to ensure your compliance before you purchase radioactive sources.

  • PASCO advertised sources are direct shipped to customers from Spectrum Techniques (  Please review their "Terms and Conditions" page before purchasing.
  • Once shipped, purchased sources are "Non-Cancellable" and "Non-Returnable". Radioactive sources cannot be returned under any circumstances including "End of  Life" disposal.


  • PASCO generally advertised sources are USNRC License Exempt (US only). 
  • International exempt sources (per the International Atomic Energy Agency) are  available for international customers or by request.