Assertion: dirty bomb's material | /r/HasAspect | combined mass of 2,300 kg
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Source sentences:
text: When the hollow-front projectile reached the target and slid over the target insert, the assembled super-critical mass of uranium would be completely surrounded by a tamper and neutron reflector of tungsten carbide and steel, both materials having a combined mass of 2,300 kg (5,100 lb).