Americium-241 has been used as a portable source of both gamma rays and alpha particles for a number of medical and industrial uses.

Most portable light sources are relatively low in light intensity and have short operating times.

The Library was developed to be a low-cost and portable source of appropriate technology information for aid and relief workers around the world.

He had intended the globe as a portable source of freely available energy.

Could this quiet, portable source of power help modern soldiers on covert military ops?

Not only does this provide a cheap and portable light source, but it also allows for easy replacement using readily available parts.

A battery is a portable source of electricity.

G95 is a free, portable, open source Fortran 95 compiler.

The sound seemed to travel ahead of them down the gently curving corridor, which was lit by a succession of portable light sources.

This process can be used to provide a convenient portable source of heat, as for on-the-spot food warming in a self-heating can.