Rank	Author	Number of Isotopes	Percent
1	Berkeley	635	19.96%
2	Darmstadt	435	13.67%
3	Cambridge	222	6.98%
4	Dubna	220	6.91%
5	CERN	119	3.74%
6	Argonne	118	3.71%
7	GANIL	85	2.67%
8	Oak Ridge	77	2.42%
9	Orsay	73	2.29%
10	RIKEN	71	2.23%
11	Michigan State	65	2.04%
12	Los Alamos	54	1.70%
13	Chicago	45	1.41%
14	Brookhaven	44	1.38%
15	Grenoble	39	1.23%
16	Studsvik	35	1.10%
	Jyväskylä	35	1.10%
	Ohio State	35	1.10%
	Berlin	35	1.10%
20	McGill	34	1.07%
21	Amsterdam	29	0.91%
22	Mainz	26	0.82%
23	Lanzhou	23	0.72%
24	Harwell	22	0.69%
	Michigan	22	0.69%
	Rochester	22	0.69%