A radioactive isotope of sulfur; for example, 35S.

radioactive sulphur

Any of the radioactive isotopes of sulphur, of which 35S is used to tag nucleic acids and is preferable to 32P as it has a longer half-life (88 days), a lower energy and bands on gels more precise.
References in periodicals archive ?
A method of counting radiosulfur in liquid samples, and its application to the determination of S35 excretion following injection of S3504.