It can be masked but cannot be completely masked.
The composition of the magnet is iron, cobalt, nickel and other atoms, the internal structure of its atoms is relatively special, and it has a magnetic moment. Magnets can generate magnetic fields and have the characteristics of attracting ferromagnetic substances such as iron, nickel, cobalt and other metals.
Radiation refers to the phenomenon that part of the electromagnetic energy emitted by the field source propagates away from the field source and then does not return to the field source, and the energy spreads outward in the form of electromagnetic waves or particles (such as alpha particles, beta particles, etc.). All objects in nature, as long as the temperature is above the absolute temperature of zero (-273.15 degrees Celsius), are constantly transmitting heat to the outside in the form of electromagnetic waves and particles, and this way of transmitting energy is called radiation.