Abstract: A scraping blade for use in a thin film dryer adapted for processing radioactive substances comprises a main body, a hing member rigidly attached to one side of the body and pivotably connected to a rotor in the dryer, a blade chip attached to the other side of the body for engaging the radioactive substance, and a screw member engaged with the body to secure the blade chip to the body. The blade chip is made of a material more than 1.2 times harder than the radioactive substance. The blade may further comprise an engaging member for screw engagement with the screw having edge portions to be engaged with recesses formed on the blade chip and the main body.

Abstract: In a spray nozzle including a nozzle structure having an internal chamber and an injecting hole provided through the nozzle structure at an outer end thereof, a control rod is provided in the internal chamber so that the outer end of the control rod projects outwardly through said injecting hole. A planar disc-shaped member is secured to the inner end of the control rod for defining a movable range in the axial direction of the same rod. A spring member is provided around the same rod for urging the rod inwardly, and a nozzle-tip member is secured to the outer end of the control rod for closing the injecting hole from outside. An apparatus utilizing the spray nozzle is further disclosed.