Naturally occurring praseodymium is composed of one stable ஓரிடத்தான், Pr. Thirty-eight கதிரியக்க ஓரிடத்தான்s have been characterized with the most stable being Pr with a அரைவாழ்வுக் காலம் of 13.57 days and Pr with a half-life of 19.12 hours. All of the remaining கதிரியக்கம் isotopes have half-lives that are less than 5.985 hours and the majority of these have half-lives that are less than 33 seconds. This element also has six meta states with the most stable being Pr (t 2.12 hours), Pr (t 14.6 minutes) and Pr (t 11 minutes).

The isotopes of praseodymium range in atomic weight from 120.955 u (Pr) to 158.955 u (Pr). The primary கதிரியக்கம் before the stable isotope, Pr, is electron capture and the primary mode after is பீட்டா சிதைவு. The primary decay products before Pr are element 58 (சீரியம்) isotopes and the primary products after are element 60 (நியோடைமியம்) isotopes.

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