CO-57 map data

These are pulse height histograms for 10 minute runs with a collimated Co-57 source positioned (nominally) at the center of each unit cell. Each plot shows a histogram for the target strip (in red) and the two adjacent strips. Histograms include only events where the target pixel row pulses were above threshold.

Ideally these plots should all look the same since the source is at the same position within the unit cell. The initial position may not have been exactly at center but all moves should be accurate to within the tolerance of the positioning table so all the positions would be off center by the same amount.

Note that the total count differs by more than an order of magnitude from the weakest cell 3,3 to the best 4,4.