Dear Fiend,
I stored at room temperature a couple of hydrogen
samples in stopcoks sealled ampoules( as described
in Max Coleman paper) over 2 years without apparent
change of pressure and D/H ratio.
This surpried me because I was aworied that loss
due to diffusion trough elastomer gasked is rather
significant. So, in your case there is no danger
at all to store your samles.
Greetings,
Stan Halas