Jafari developed a string of tiny calibrated silica beads that can be used to measure radiation inside a patient's body. She demonstrated that the amount of radiation each bead receives can be measured using a simple thermoluminescence reader. The glass beads cost significantly less than contemporary Dosimeters and also address the dosimetric challenges of modern radiotherapy techniques. They ran proof-of-concept experiments at Queen Alexandra Hospital in Portsmouth. She was inspired to create the beads because of the lack of cancer treatment in Afghanistan, where her father died prematurely of cancer. In 2016 Jafari became one of 15 women entrepreneurs to win a £50,000 Innovate UK Infocus Award. She is the founder and CTO of TRUEinvivo. A patent for her technology was granted in 2019. Jafari is part of the UK Sirius programme for graduate entrepreneurs.