Fluorescent Response of Scintillation Crystals to Heavy Ions

The light output of CsI(Tl) was measured as a function of energy for incident ions of ${\mathrm{B}}^{10}$, ${\mathrm{B}}^{11}$, ${\mathrm{C}}^{12}$, ${\mathrm{N}}^{14}$, ${\mathrm{O}}^{16}$, and ${\mathrm{F}}^{19}$. The response of NE 102 plastic and anthracene scintillators was also measured for ions of ${\mathrm{N}}^{14}$ and ${\mathrm{O}}^{16}$, respectively. The response of CsI was essentially linear for energies above $6 \mathrm{Mev}/A$, where $A$ is the mass number of the incident ion. The NE 102 was linear for energies above $4 \mathrm{Mev}/A$. The anthracene data showed slight curvature even at $9 \mathrm{Mev}/A$. It would appear that the response of CsI differs somewhat among crystal samples.