We have been irradiating locally made thick walled polythene capsule in Rabbit system of PARR-1 at 3xE13 neutron cm-2s-1 for one hr. FRM II uses polythene capsule for irradiation upto 5 hr at neutron flux of 7xE13 cm-2 s-1

Transparent polythene bags are excellent for irradiation. We used them to irradiate repeatedly at 5x10e11 flux for 6 hrs and through temp of about 30-60oC. However, you should avoid those with colour, coz must chromophore contain a number of metals.

Szia Dénes,

We use polyethylene vials for (inner encapsulation of) most of our irradiations in the OPAL reactor.  We have a maximum fluence limit of 7.2x1017 cm-2 (ie 20 hours at a flux of 1013 cm-2.s-1) which we routinely do - I suspect this is a very conservative limit as the vials are in excellent condition after such irradiations.  Another proviso is that temperature does not exceed 90°C after which PE begins to soften (all of our pneumatic positions are actively cooled during irradiation).  At the fluxes you use I'd be more concerned about the temperature than the radiation damage.

We don't normally use vials as large as the ones you suggested - we did consider using those exact ones (I think they used to be called Emerald Plastics?) but used Kartell vials instead (link below) simply because it was easier to purchase.  Normally we use much smaller vials from Posthumus Plastics.  Characterising them for impurities is very important as some elements will inevitably need to be corrected for those elements that are in the vials (of course re-encapsulation after irradiation is an alternative to blank corrections, but we prefer not to).  From what we've seen the reproducibility of the impurities in the plastics is good, but beware when the manufacturer suddenly changes the source of the plastics and you have to re-characterise all of your vials (this just happened to us).

http://www.kartelllabware.com/en/content/sample-vials

http://posthumusplastics.nl/index.php/en/rabbit-program