More thread necromancy from me...
Found the following via an article about Aussie Centurion MBTs used in Vietnam. It provides an anecdotal account starting in 1953, when one of the then very new Australian Centurions (number 169041) was placed about 500 yards from the blast zone of a nuclear weapons test.
The device was detonated on a tower so not quite a ground detonation but not a typical airburst height either. The tower and 169041 are visible in image #8.
The results are quite interesting and support the comment above from TheDark (AKA Vespers War). The last paragraph of the page is interesting in itself. 169041 was still operational in 1995 as a 'mascot' vehicle of the 1st Armoured Regiment.
http://www.raeme.info/opse746.php?op...item=3#article