Stop the Radscorpions

Stop the Radscorpions is a side quest in Fallout.

Detailed walkthrough
Upon entering Shady Sands, the Vault Dweller needs to speak to Seth or Aradesh. They will tell them about the radscorpions attacking their town. Aradesh will also direct the Vault Dweller as to the whereabouts of Razlo.

Razlo is located in his home in the southern building at the entrance section of Shady Sands. Talk to him during the day, and he will provide some background information on the radscorpions, and explain that he can produce an antidote to the radscorpion venom if the Vault Dweller brings him a scorpion tail.

After speaking to Razlo, the Vault Dweller should then speak to Seth. He will offer to take them to the radscorpion cave and once there the Vault Dweller has a few options on how to proceed.
 * Enter the cave and kill all 9 radscorpions.
 * The second option is to place explosives at the entrance of the caves and seal the radscorpions in. There is a specific portion of the cave that "seems a bit weaker". If the Vault Dweller plants an explosive here, it will cause a cave-in, trapping all of the radscorpions inside. If the Vault Dweller is on the wrong side of the cave-in, however, it's game over.
 * Explosives can be obtained by bartering with the gate guard, or by searching bookshelves around town. Since this quest is acquired near the start of the game, searching Shady Sands is the preferable option.

Rewards
By killing all radscorpions in the cave:
 * 500 XP.
 * +6 Reputation.

By sealing the radscorpion cave entrance: Note: 300 is the minimum. If you kill more radscorpions before placing the explosives this will net additional XP.
 * 300 XP.
 * +6 Reputation.
 * The Vault Dweller can get rewards for both solutions.

Related quests

 * Cure Jarvis of Radscorpion Poison
 * Make Poison Antidote