The Radiation debuff is definitely a bit too punishing right now when applied to the player, there will be a tweak to it in the next update. The only way it can apply to you is if one of your own bullets with radiation is reflected back at you, so if you collect that ammo mod just try to be careful when firing at Holoshields or barriers for now.
Also I'm not sure where you are describing with "purple grass barriers", my best guess is you meant the Solus quill areas with the purple sacks littered around. If one of the quill gates blocked you, usually there is a Quill Nest nearby that needs to be destroyed to open the gate. It's possible you rolled behind a loot gate though and it didn't lower to let you out after skipping it. If you get stuck again try to take a screenshot where it was and it will be easier for us to locate and fix it.
