A radioactive iodine uptake (RAIU) test uses a radioactive tracer and a special probe to measure how much tracer the thyroid gland absorbs from the blood. The test can show how much tracer is absorbed by the thyroid gland.
Learn How to Lay Blocks. Start mixing mortar mix as instructed. The first course of blocks should be installed below floor level and inside the foundation trench. This first line of concrete blocks shall rest on top of a layer of mortar mix. Spread mortar along the sides of the block and remove the excess mortar with a trowel. Repeat until the first course has been installed. Check the course with a level. Then, even it out with a thicker layer of mortar, if it is not.
Other sizes are generally half of a CMU, measured either vertically or horizontally. Modern concrete blocks are made of a combination of Portland cement, heavy- or light-weight aggregate, water and additives to improve curing. A standard concrete block is 7 5/8 in. wide by 7 5/8 in. tall by 15 5/8 in. long. With a 3/8-in. masonry joint, that equates to 8-by-8-by-16 inches when the block is installed in a structure. To reduce weight, concrete blocks usually have two or three hollow cores taking up about 50 percent of the block's volume.