The invention relates to lead shielding (1) for a betatron (2) in an X-ray generator, consisting of at least four shielding parts (7, 8, 9, 10) of which two (7, 8) are semi-cylindrical and provided with recesses (11, 12) in the envelope surfaces thereof. The semi-cylindrical shielding parts (7, 8) are arranged in corresponding recesses of the remaining shielding parts (9, 19), by means of the envelope surfaces thereof, such that the recesses (11, 12) in the envelope surfaces form air channels between the semi-cylindrical shielding parts (7, 8) and the remaining shielding parts (9, 10).
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