This appears to be prodigiously powerful, but has a --dry-run option and support for whitelists. I love the fact that it's a lightweight and verbose script.
A trip to Wanamakers at Christmas (including eating in the top-floor restaurant and listening to scheduled organ concerts) was a treasured fixture of my childhood in the late 50s and early 60s. If I remember correctly, there was a monorail-like tram that ran around the periphery of the toy department too. Christmas lights festooned the facade of the organ.
Depending on the field, 3 Gy IS 'small' (with respect to doses to tissue during cancer treatment, which can be 60 Gy). Whole body doses of 1 milliGy in the environmental biz are considered worth examination. Even investigations of biomarkers for radiation exposure typically use doses in the range of 3 Gy.