Scientists at the Bhabha Atomic Research Centre’s Radio Chemistry Division in Trombay have isolated and purified curium-242, the heaviest man-made element prepared in India to date. The breakthrough, reported in the latest issue of Nuclear India, produced a small but significant quantity of the isotope that will support further research into heavy-element chemistry and the recovery of useful transplutonium materials.
curium-242 India production at BARC
The curium-242 was obtained by irradiating indigenously prepared americium-241 in the Cirus reactor. The irradiated material, enclosed in sealed containers, yielded an intensely radioactive product that was processed in glove boxes to separate curium-242 from residual americium and a range of fission products. The final yield was estimated at roughly 30 micrograms, identified by its characteristic alpha energies of 6.11 and 6.07 MeV.
Although the quantity is minute, the result is important for several reasons. Small batches of curium allow chemists to study the element’s chemical behaviour under controlled conditions. Such knowledge is essential to develop methods for recovering longer-lived isotopes, notably curium-244, which is produced in larger quantities as a byproduct in power reactors. Curium-244, in turn, is a feedstock for the preparation of still heavier transplutonium elements in future research programmes.
Curium-242 has distinctive practical properties. With a specific activity of about 3,297 curies per gramme and a half-life of 163 days, it is a potent source of alpha radiation. Historically, a curium isotope was the first man-made element to reach the Moon aboard Surveyor V in 1967, where it was used to analyse lunar soil through alpha scattering. The isotope’s heat output — around 120 watts per gramme — also makes it suitable for compact, reliable power sources in remote applications of relatively short duration.
The Trombay team’s work demonstrates India’s growing capabilities in radiochemical processing and in handling highly radioactive materials with appropriate containment and safety measures. Producing and purifying transplutonium elements requires specialised facilities, expert personnel and stringent protocols; achieving this at BARC signals capacity that will support both basic science and applied technology.
Beyond the laboratory, the effort has implications for strategic research planning. Recovering curium-244 and mastering subsequent element production are steps towards generating isotopes that are valuable for scientific experiments and for potential technological uses. As international interest in advanced nuclear materials continues, domestic ability to produce and study such isotopes helps reduce reliance on external sources and strengthens national research infrastructure.
Experts caution that handling curium and other transplutonium elements involves significant radiological risk and requires long-term waste-management strategies. The quantities currently produced are small and intended primarily for study rather than industrial deployment. Nonetheless, these controlled experiments are essential for developing safe, repeatable processes for isotope recovery and for opening pathways to future discoveries in heavy-element chemistry.
In sum, BARC’s isolation and purification of curium-242 represents a methodical scientific advance. It positions India to pursue further transplutonium research, supports the development of specialised isotope technologies and underlines the country’s technical competence in nuclear chemistry.
Key Takeaways:
- BARC’s Radio Chemistry Division at Trombay has isolated and purified curium-242, marking an important Indian advance in heavy-element research.
- The team produced about 30 micrograms of curium-242 by irradiating americium-241 in the Cirus reactor and identifying the isotope via its alpha energies.
- curium-242 India efforts aim to improve understanding of chemical behaviour to recover longer-lived isotopes such as curium-244 for future transplutonium work.
- Curium-242 serves as a high-specific-activity alpha source and a compact short-term power source, underscoring its scientific and practical applications.
