The Saphymo-SRAT S.P.P.2 NF scintillometer is manufactured by Saphymo-PHY, Massy, France. It is designed for onsite measurements of gamma radiation. The detector is a 1 x 1.5 inch (15.2 cm³ ) NaI(Tl) (sodium iodide activated with thallium) scintillation crystal. The operation range for gamma radiation is 0.02 to 30 microsieverts per hour (µSv/h). The instrument has a built in audible alarm that gives a high signal. The unit of measurement used by the SRAT is cps (counts per second).