Point source phantom. Jon ShahN. HerzogHans WeirichChristoph TellmannLutz KaffankeJoachim CaldeiraLiliana Rota KopsElena M. QaimSyed H. CoenenHeinz IidaHidehiro 2014 <p>The block of polyethylene foam consists of two halves whereby on the inner surface of one half, a disk-shaped protrusion fits into a disk-shaped recess on the other. A radioactive drop is placed right in the centre of the cubic block of polyethylene foam with a density of 0.1 g/cm<sup>3</sup>.</p>