Their breakthrough was to take what had long been considered alpha radiation’s greatest disadvantage and turn it into its strength. Alpha particles can cause devastating damage to cells, but they travel only a very short distance through tissue; even a sheet of paper can stop them. That makes it difficult to use them to irradiate a tumor deep inside the body from an external source.
Ronen Segal--CTO-- is in the 1st pix
https://www.ynetnews.com/tech-and-digital/article/hjwu50jdmg