It is called Lead Shielding.
It is called thermal shield
Blanket
The layer of lead around the core of a nuclear reactor is known as the reflector. It helps to reflect neutrons back into the core, increasing the number available for fission reactions. This contributes to the overall efficiency and effectiveness of the reactor.
Do not understand use of the word 'layer'
To stop radiation leaking out. Alpha and Beta types of radiation will be stopped by the concrete
A nuclear reactor containment spray system typically consists of a network of pipes and nozzles that spray water or other cooling agents onto the reactor containment structure in the event of an emergency. This helps to remove heat from the reactor and prevent the containment structure from overheating, which can lead to the release of radioactive material. The spray system is designed to provide an additional layer of safety and is activated automatically or manually in response to specific conditions.
Extrinsic membrane Extrinsic membrane
The covering of the nucleus is called the nuclear membrane. The nuclear membrane contains pores called nuclear pores. These pores allow ribosomes made in the nucleolus (which floats inside the nucleus) to be sent out onto the cytoplasm or to attach to the endoplasmic reticulum.
The outer layer of the nucleus is called the nuclear envelope. It consists of two membranes, the inner and outer nuclear membranes, that help to protect and regulate the movement of molecules in and out of the nucleus.
The layer that surrounds the core of the Sun is called the Puenelsome. Here is where Nitrogen gets converted into nuclear energy.
The double layer of membrane surrounding the nucleus is called the nuclear envelope. It consists of an outer and inner membrane with pores that regulate the passage of molecules in and out of the nucleus.
The membrane surrounding the nucleus is simply called the nuclear membrane. It is a phospholipid bilayer. The nuclear membrane merges with the endoplasmic reticulum, and you can learn more by using the link below.