The monk sat down with a splash that sprayed the room. Sister Helene clucked, sputtered, squeaked, dumped the tray on the workbench, and fled. Joshua vaulted out of the sink and donned his habit without bothering to dry himself or put on his underwear. When he got to the door, Sister Helene was already out of the corridor-probably out of the building and halfway to the sister’s chapel just down the side lane. Mortified, he hastened to complete his labors. He emptied the suction device’s contents and collected a sample of the dust in a phial. He took the phial to the workbench, plugged in a pair of headphones, and held the phial at a measured distance from the detector element of a radiation counter while he consulted his watch and listened. The compressor had a built-in counter. He pressed a stud marked: RESET.