Under normal circumstances, lead is very heavy. In the field of radiation protection, it has been widely used and promoted because of its superior protective performance, economic performance, and construction performance.
Lead is within 10mm and can be used in rolls or sheets. It can be easily cut and cut into different specifications during the application process to meet radiation protection requirements. When the thickness of lead is >10mm, it is not easy to cut and cut. At the same time, due to the weight, construction is inconvenient, so lead bricks were born.
Lead brick shapes: cuboid, rhombus, trapezoid. According to the method of use, the splicing of lead bricks is yin and yang interlocking, or positive and negative connection, or staggered peak overlap, or trapezoidal interlocking. The shape of the lead brick is determined according to the method of use.
The core assessment indicators for industrial lead products mainly include three aspects: First, the purity and composition of material components;
Whether it meets the application requirements of the corresponding scenario; second, whether the errors in the size, thickness and other specification parameters of the product are within the allowable range; third, whether the process quality of the product is up to standard, without defects such as deformation and impurities
Typical implementation cases
Case 1: Overall shielding of CT machine rooms in county-level hospitals
The walls and floors around the computer room are all built with staggered joints of 1mmpb standard protective lead bricks, and lead bricks are added to overlap the yin and yang corners and pipeline openings. They are matched with lead plate doors and windows. After completion, the radiation leakage value is far lower than the national safety limit.
Case 2: Steel structure factory industrial gamma flaw detection closed machine room
The factory building is an independent compartment, with two layers of high-equivalent lead bricks stacked on the wall, and a lead brick buffer protective wall set up outside the door, which is used for radiographic flaw detection of large quantities of welds every day to protect the radiation safety of factory workers.
Case 3: Nuclear medicine iodine 131 ward storage room
A small independent storage room with six fully thickened high-density lead brick sealed walls is specially used to store radioactive drugs to prevent radiation from spreading to corridors and medical office areas.
Case 4: Overall shielding project of large PET-CT center
PET rays have high energy and a wide radiation range. The walls, floors, and ceilings are uniformly constructed with heavy lead bricks. The observation window base and equipment base are simultaneously constructed with lead brick counterweights and shielding.
Case 5: Radioactive source storage cellar (backup for construction site flaw detection)
Large pieces of cast lead bricks are stacked in the underground foundation pit to form a closed cellar. When the cobalt 60 flaw detection source is not in use, it is placed in the cellar for storage. There is no fixed machine room for temporary protection at the field construction site.
Case 6: Small partition of pet DR radiation room
Thin protective lead bricks are built on a single wall of a small single room, and the cost is lower than the whole lead plate, which meets the basic radiation protection needs of animal filming.
Key points for distinguishing scenes
1. Medical low-energy X-ray: ordinary dense lead bricks are enough;
2. γ-rays, high-energy CT, nuclides: high-purity, high-density thickened lead bricks;
3. Only counterweight without radiation protection: low-price recycled lead bricks can be used;
4. Permanent wall project: pouring solid lead bricks; temporary enclosure: standard square assembled lead bricks
Personal protection of operators:
It is recommended to wear X-ray protective gloves when touching lead bricks to avoid direct skin contact
Use a high-temperature anti-splash mask when cutting or handling to prevent lead chips from flying.
Long-term working environments should be equipped with radiation detectors to monitor the protection effect in real time.
