A study was made of the release of 133Xe from single crystals. The Xe was incorporated into the crystals by doping with precursor 133I or by fission recoil from an external source. The data, for 150 to 500C, could be described by:

D (cm2/s) = 0.57 exp[-1.00(eV)/kT]

The results were most consistent with a model in which the gas atoms were associated with mobile defect clusters and diffused, with these clusters, through the crystal lattice. Rare Gas Diffusion in Alkali Metal Iodides. L.D.Mears, T.S.Elleman: Physica Status Solidi A, 1971, 7[2], 509-21

 

Table 197

Diffusivity of 42K in CsI

 

Temperature (K)

D (cm2/s)

400.1

1.686 x 10-10

420.3

3.946 x 10-10

424.1

4.640 x 10-10

447.0

1.061 x 10-9

494.2

4.533 x 10-9

531.3

1.129 x 10-8

587.6

5.295 x 10-8

590.7

5.405 x 10-8

594.2

5.960 x 10-8

611.2

9.950 x 10-8

616.8

1.148 x 10-7