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In which rocket model is promethium used to provide illumination?

  1. M72 LAW rocket

  2. AN-VDR-2 RADIAC set

  3. Troxler Density Moisture Tester

  4. PGU 20U

The correct answer is: M72 LAW rocket

Promethium is a radioactive isotope that is used in certain military applications for its luminescent properties, primarily for providing illumination. In the context of rocket models, the M72 LAW (Light Anti-Tank Weapon) is known to utilize promethium as part of its design to enhance visibility for users in low-light conditions. The inclusion of this isotope helps in illuminating the sights, making it easier to aim accurately in various lighting environments. The other options, while they have their own purposes and functions, do not utilize promethium for illumination. The AN-VDR-2 RADIAC set is mainly used for radiation detection and measurement; Troxler Density Moisture Tester is designed for measuring density and moisture in soil and asphalt; and the PGU 20U is a type of armor-piercing ammunition. None of these involve the application of promethium for illumination purposes, which solidifies the choice of the M72 LAW rocket as the correct answer.