This angled benchtop beta shield's angled face section permits easy viewing. Base is large enough to hold mini-containment chambers block racks or microtube racks. 1/2 inch (13mm) thick acrylic. WARNING! Radioactive waste should never be stored on the benchtop for long periods of time and should be disposed of properly. Proper handling and storage of isotopes will minimize exposure to radiation. For standards related to exposure refer to United States Nuclear Regulatory Commission Rules and Regulations Title 10 Chapter 1 Part 20. Dimensions: 457 x 305 x 162mm (18 x 12 x 6-3/8 inch). Material: acrylic. Thickness: 1/2 inch (13mm). 1/Case. Nalgene® #: 6802-0001.