Hands-on maintenance activities outside the X-1 aluminum chamber may be allowed within a few hours following radiation (photoneutron) shots. Dose rates outside the chamber following moderate yield (200 MJ) shots are four orders of magnitude higher than those following radiation shots. In the mean time, dose rates following high yield (1000 MJ) shots are a factor of five higher than those following moderate yield shots. Hands-on maintenance is allowed outside the chamber and inside the water tank within 10 and 14 days following moderate and high yield shots, respectively. Access to the area outside the water filled tank is allowed after only a few hours following moderate and high yield shots.