Repulsion device Repulsion devices are technological security devices used to prevent a person from entering a specific area , confine captives to a particular zone or make a person unable to perform a specific action . There are several types of repulsion devices like laser tripwires and pulse fields , but the most commonly used and the most famous is the force field . Force fields . Force fields are photonic resonance barrier creating a wall of energy . They have many applications and varying degrees of strength and can either completely block a passage or injure a person passing through . However , most force fields are non - lethal . Generally , solid objects cannot pass through it . Generator force field . The most common pre - War and post - War force fields . They are powered by a separate power source and can usually be disabled with an accessible mean . Yellow force field . The principal force fields used in New California . It has a yellow color and is powered by an emitter positioned to the left . It is impossible to pass through it without disabling it first . Yellow force fields may be temporarily disabled by tinkering with the force field emitter . Red force field . This force field is similar to the yellow field , but bears the important distinction of being permeable - a person can pass through it , but will sustain a small amount of damage , depending on their armor . Orange force field . This version can be encountered in the NCR . It uses 4 pairs of emitters that are aimed parallel to the ground , creating 4 orange bars . This kind of force field is impassable . Blue force field . An advanced force field referred to by Liberty Prime as a " photonic resonance barrier " , mostly used by the Enclave after 2241 . It has a blue color and is powered by two large transportable generators , one on either side of the path . These generate the blue force field between the two pylon generators and have an increased width and the size than a standard force field . It is possible to create a large barrier by combining several blue force fields between them . Generators cannot be destroyed and it is impossible to pass through them . Forcefields used to protect sections of Raven Rock and the mobile base crawler can be bypassed using nearby terminals , although doing so requires a high ( 80 ) science skill . They can also be damaged with the Explosives skill ( 50 ) , allowing access but at the cost of slight health damage when passing through the field . Smashing the panel has a similar effect . Door force fields . A rare force field and one of the two types used by alien s . They are powered by several beams embedded in the margins of an entry and they cannot be moved . Yellow force field . A force field only used in Vault City and the Enclave Oil Rig , possibly a refinement of the force field used elsewhere in New California . It has a yellow color and is used in captive areas as a door . It is impossible to pass through it without disabling it first . They can be disabled through nearby terminals . Blue force field . A force field only used in the Sierra Madre vault . It has a blue color and it used in the entrance area front in the entry of the Sierra Madre vault as a door . It is impossible to pass through it without disabling it first . They can be disabled by remote hacking . White force field . The principal force field of alien s . It has a white color and it used in captive areas as a door . It is impossible to pass through it without disabling it first . They can be disabled by using nearby terminals or buttons . Big MT force field . Big MT have developed several versions of force field based on the blue photonic resonance force field . However , they were created in a different frequency than other and a sonic emitter upgraded with the X - 8 vertebrae - pulse - de - sensitizer frequency can easily disable them . Blue force field . The standard force field used in Big MT , created by several beams inscruted in a structure . It is possible to create a large barrier by combining several blue force field between them . Container force field . A container equipped with a blue force field . Force field generator . A deployable force field used by aliens that protects against ballistic and energy weapon fire , and which also inhibit the movement of people . It can be deactivated by destroying the projection unit behind the force field . Pulse field . An electromagnetic pulse grid used by the Chinese to protect their base of operations in the Anchorage Reclamation simulation . It paralyzes the circuits of every electronic device crossing it , including power armor , causing irreversibly fatal damage and the wearer to suffer a massive electrocution through powerful electromagnetic pulses ( powerful EMP has minimal effects on biological systems but the wearer here is linked to their power armor ) . It can be disabled by a controlled computer terminal near it . Pacification field . A unique field used in Big MT at The Think Tank dome . It prevents any lobotomite from accessing the aggression center in their brain and rendering them unable to attack . Radar fence . The radar fence is a kind of radar - guided repulsive field around the perimeter of Big MT . Erected by Doctor Mobius to prevent the think tank s from escaping into the wasteland , it keeps the Courier from leaving the Big MT until he / she finishes the " Old World Blues " main questline . Energy field . A unique field implanted in the Secret Vault .