Srimad-Bhagavatam: Canto 1 - Chapter 1 - Verse 28

Sanskrit:

न ह्यस्यान्यतमं किञ्चिदस्त्रं प्रत्यवकर्शनम् ।जह्यस्त्रतेज उन्नद्धमस्त्रज्ञो ह्यस्त्रतेजसा ॥ २८ ॥

ITRANS:

na hy asyānyatamaṁ kiñcidastraṁ pratyavakarśanamjahy astra-teja unnaddhamastra-jño hy astra-tejasā

Translation:

O Arjuna, only another brahmāstra can counteract this weapon. Since you are expert in the military science, subdue this weapon’s glare with the power of your own weapon.

Purport:

For the atomic bombs there is no counterweapon to neutralize the effects. But by subtle science the action of a brahmāstra can be counteracted, and those who were expert in the military science in those days could counteract the brahmāstra. The son of Droṇācārya did not know the art of counteracting the weapon, and therefore Arjuna was asked to counteract it by the power of his own weapon.