TEPCO released the diagram showing the radiation level on July 6 when the bots went inside the Reactor 3 building, and the measurements are lower than July 2 data. However, July 6 measurements were taken at 2.5 meters off the floor whereas July 2 measurements were done at 1 meter off the floor. On June 9 it was humans who measured the radiation, without the benefit of the double steel sheets. (I wonder what kind of boots they were wearing. I sure hope their boots had lead or tungsten soles.)
According to Asahi Shinbun, the Warrior robot tried to measure the radiation at the candidate location for the nitrogen injection pipe installation, but it couldn't get there. It took the measurement at 5 meters above the floor near the location, and the radiation there was 50 millisieverts/hour, almost double the radiation at 2.5 meters.
The radiation level at 5 meters is not noted in the TEPCO's diagram below.
TEPCO is considering sending the humans again on July 8. All this in order to comply with the government-mandated July 17 deadline for "stable cooling of the reactors" so that the Kan Administration can proudly announce "Now it's safe for the residents in the planned evacuation zone to come home!"
TEPCO that cannot say "No" to the government; instead, it will send the anonymous human workers in the high-radiation zone.