The Gamma Ray Projector was an immense device that harnessed and projected beams of concentrated gamma radiation. Inventor Bruce Banner designed the projector based on the same technology that he used when creating the Gamma Bomb that first transformed him into the incredible Hulk. Also referred to as the Gamma Gun, it was first used when Banner needed it to repel an invasion of alien Tribbitites. 
Banner then created a second, smaller Gamma Ray Projector, which he secretly erected inside his sanctuary cave. He left operating instructions with Rick Jones who in turn used it to give the Hulk restricted doses of Gamma radiation. These treatments enabled Bruce Banner to maintain his intellect while still in the form of the Hulk 
As Dr. Banner continued to switch back and forth between his human and his Hulk form, the Gamma Ray Machine grew more unpredictable each time it was used, manifesting unexpected side effects, such as partial transformation or delayed reaction to the exposure.
The machine was activated again by a spy who infiltrated the Los Diablos Missile Base, becoming the Abomination: he then destroyed the Gamma Ray Project before it overloaded his body with radiation.
In the 1977 Film Dr. David Banner concludes that high levels of gamma radiation from sunspots are the cause, and the emotional stress experienced in these situations combined with the gamma radiation altered the body chemistry to cause an increase in strength. In a tragic twist, it is revealed that while Dr. Banner's own body would have been the most receptive to the sunspot-based gamma augmentation, the car accident that claimed his wife had occurred on a day with the least sunspot-based gamma activity. To test his theory, Dr. Banner bombards his own body with gamma radiation. Unknown to Dr. Banner, his equipment has been upgraded, causing him to administer a far higher dose of gamma radiation to himself than he had intended. Dr. Banner attempts to lift a heavy object to test his strength, but is unable to, so he leaves the lab in disgust, thinking the experiment failed.
At Culver University in Virginia, General Thaddeus "Thunderbolt" Ross meets with Dr. Bruce Banner, the colleague and lover of his daughter Dr. Betty Ross , regarding an experiment which is meant, as Ross claims, to make humans immune to gamma radiation. The experiment, which is part of an operation Ross hopes will restart Dr. Abraham Erskine's failed "super soldier" program fails and exposes Banner to huge amounts of gamma radiation. This has the effect of transforming Banner into the Hulk whenever Banner becomes angry. As the Hulk, he destroys the lab and injures Betty.
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- 51 Appearances of Gamma Ray Projector
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