This paper reviews the literatureon beryllium,emphasizingthe effects of irradiationon essentialproperties. Swelling and embrittlement experimentsas a function of irradiationtemperatureand dose, and and as a function of neutron sp ztrum are described,and the resultsare quantified, where possible. Effects of impuritycontent are also reported,from which optimum compositionspecifications can be defined. Microstructural informationhas also been obtained to elucidatethe processescontrolling the propertychanges. The availableinformationindicatesthat berylliumdivertorscan be expected to embrittlequickly and may need frequent replacement.

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