A vacuum for radioactive emissions?

On page 120 of the second volume of Sharon of Two Salems:

She looked down at her robotic form, and it had no colors emanating from it to the orb. Her form could function in close proximity to the sphere because it depended on plain old electricity to run. That part still didn’t make sense to Sharon. If the orb was vacuuming up something as powerful as radioactive emissions, why weren’t the lesser forms of electromagnetic radiation being sucked up, too? However, this was a good thing; their electrically powered robotic forms wouldn’t function if the orb suddenly started absorbing regular old electricity as well.

The assumption in this paragraph is that there could be some undiscovered field of physics that would allow for radioactive emissions pouring in all directions from a source to be somehow deflected or "bent"...without affecting other forms of electromagnetic radiation. Also the assumption is that the orb absorbing the radioactivity wouldn't affect physical matter, either.

It is know that very heavy objects in deep space (such as a compact cluster of galaxies) can cause a phenomenon called "gravitational lensing." The light from objects behind the heavy mass is actually bent as it passes by. To us here on Earth, looking through our telescopes at places in space this is occurring at results in us seeing a visual distortion of the object behind. Here's a classic example:

Strong gravitational lens LRG 3-757

From Wikipedia:

What's large and blue and can wrap itself around an entire galaxy? A gravitational lens mirage. Pictured above, the gravity of a luminous red galaxy (LRG) has gravitationally distorted the light from a much more distant blue galaxy. More typically, such light bending results in two discernible images of the distant galaxy, but here the lens alignment is so precise that the background galaxy is distorted into a horseshoe -- a nearly complete ring.

The "orbs" in Sharon of Two Salems have been written to be about as big as a super large beach ball. If something that size could not only bend rays of radioactivity but suck them into itself as well, it would be more powerful than the strongest gravitational lenses we can see in space. Remember, we can still see the objects behind the "lenses"--but in the story, the radioactivity is completely diverted to the orb and consumed by it (the latter will be a topic for a future blog post).

The orb would have to be gravitationally more powerful than the largest objects (or clusters of objects) in space, yet smaller than a car. In this universe, I (the author) have to admit that's physically impossible. Not only would radiation be swept up into it, but light and physical objects as well. In fact, it would be a black hole...easily sucking up the entire earth, all the other planets and their moons, and the sun. It's "event horizon" would extend well beyond the reaches of the Kuiper Belt, and it would probably consume those space rocks as well.

But it is fiction we're talking about...I just haven't thought of a good MADE-UP way to explain it...