Only in H-bombs, not A-bombs. There are no 2kt H-bombs. All H-bombs start in the megatons. Suitcase nukes are simple a-bombs.
To a dummy like me who is trying to follow this conversation, can you explain why an A bomb is better (if that's what you're saying)? Is it just a smaller explosion? Less radiation? I'm interested since I probably live in one of the 9 cities with the highest Jewish population.
Wrong. In a small A-bomb Tritium, IIRC, is used a neutron source to speed up the reaction and get a proper "earth-shattering kaboom." Without it (or with helium) it fizzles - messy, dirty, but not "kaboom."