March marks a significant occasion to recognize the contributions of women in science, particularly those who played pivotal roles in the development of physics and chemistry at the Australian Nuclear Science and Technology Organisation (ANSTO). This year, in honor of International Women’s Day, ANSTO highlights the achievements of pioneering female scientists who faced historical challenges, often being sidelined or inadequately credited for their groundbreaking work.
One such scientist is Marietta Blau, who dedicated fifteen years to the development of nuclear photographic emulsions. These chemical films were crucial for recording and measuring the tracks of charged particles resulting from nuclear reactions. Blau collaborated with leading manufacturers, Agfa and Ilford, to create emulsions that could accurately distinguish between alpha particles and protons, thus allowing scientists to determine particle energies by measuring track lengths under a microscope.
Groundbreaking Discoveries in Particle Physics
In 1937, Blau and her colleague, Hertha Wambacher, made a remarkable discovery that would lay the foundation for particle physics. They positioned emulsion plates at an altitude of 2,300 metres on Hafelekar Mountain, where they observed striking starbursts of particle tracks radiating from a single point. These were cosmic ray particles disintegrating heavy nuclei in the emulsion, a phenomenon they named “Zertrummerungsterne,” or disintegration stars. Their groundbreaking work not only contributed to the field of particle physics but also illustrated the potential of women in science during a time when their contributions were often overlooked.
Despite the significance of their findings, Blau faced immense pressure from her colleagues to list Wambacher’s name before hers when publishing their results. Shortly thereafter, the political landscape shifted dramatically with the German annexation of Austria, which forced Blau to leave her home country and continue her work elsewhere. This situation underscores the challenges that many women in science have faced, particularly in eras marked by political upheaval and societal constraints.
As ANSTO reflects on the contributions of women like Blau and Wambacher, it becomes evident that their stories are not just part of scientific history but also a testament to resilience and determination. The recognition of their work during International Women’s Day serves as a reminder of the importance of acknowledging and celebrating the contributions of women in science, both past and present.
In honoring these pioneering women, ANSTO aims to inspire future generations of female scientists to pursue their passions and push the boundaries of scientific exploration. Their legacies are a powerful reminder of the critical roles women have played—and continue to play—in shaping the world of science.
