Disposable activated charcoal cartridge efficiently absorbs the S-35 radioactive component released from S-35 labeled amino acids. Capturing the released volatile radioactivity lessens the chance of breathing the volatile component and reduces contamination of the incubator and the water in the humidity pan. Place cartridges on the incubator shelf and, after use, dispose in regular beta waste containers. Cartridges are sealed with a highly porous durable membrane. 3 per pack.