Abstract
The effect of 13⋅5 MeV electron bombardment on the response of diamonds as conduction counters for
α
- or
β
-radiation has been investigated. The counting pulse heights decrease progressively with increasing electron bombardment flux until after a total flux of 4 x 10
16
electrons/cm
2
they are barely detectable. Both counting and non-counting diamonds also become perceptibly bluish green after bombardment fluxes of this order. The collision model of damage gives a satisfactory interpretation of the general effects of bombardment, and differences between the intrinsic textural defects and those induced by bombardment can be attributed to the presence of interstitial carbon atoms after damage. However, the initial rapid decrease in pulse heights requires an additional disordering mechanism, and it is suggested that preferential damage in the vicinity of intrinsic aggregates of vacant sites may lead to partial graphitization of such regions.
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