Well, that's a first. I don't usually answer questions here on Clarity.fm with my electrical engineer hat on.

Shielding materials vary depending on the frequency distribution of EM waves emanating from the source. The same medium will have a greater or lesser attenuating effect for high and low frequencies – e.g. microwaves and radio waves. Also, energy will dissipate across distance even in a vacuum.

The government uses more robust computers that are insulated against electromagnetic leakage, since keyboard signals can be externally tapped, giving away passwords.

Plastics are used. So is copper mesh for RF shielding – though not for microwave frequencies. The range of suitable materials is actually quite extensive, and multiple substances may need to be utilized in combination, depending on the frequency distribution. Thickness is a factor as well, obviously.

Hire an electrical engineering student to evaluate the frequency spectrum emanating from your target devices. The student ought to be able to suggest materials and design shielding to reduce energy levels below any desired threshold.

One of my professors was involved with mathematical simulations of EM penetration into child brains during the early days of cell phones. (Kids have less shielding, since their ears and skull are smaller. SWell, that's a first. I don't usually answer questions here on Clarity.fm with my electrical engineer hat on.

Shielding materials vary depending on the frequency distribution of EM waves emanating from the source. The same medium will have a greater or lesser attenuating effect for high and low frequencies – e.g. microwaves and radio waves. Also, energy will dissipate across distance even in a vacuum.

The government uses more robust computers that are insulated against electromagnetic leakage, since keyboard signals can be externally tapped, giving away passwords.

Plastics are used. So is copper mesh for RF shielding – though not for microwave frequencies. The range of suitable materials is actually quite extensive, and multiple substances may need to be utilized in combination, depending on the frequency distribution. Thickness is a factor as well, obviously.

Hire an electrical engineering student to evaluate the frequency spectrum emanating from your target devices. The student ought to be able to suggest materials and design shielding to reduce energy levels below any desired threshold.

One of my professors was involved with mathematical simulations of EM penetration into child brains during the early days of cell phones. (Kids have less shielding, since their ears and skull are smaller. So the industry standards are based on such small heads as the limiting case.)