Radiation Alert Ranger EXP · English (PDF) (PDF) | Spanish. Monitor 4, Monitor 4EC, & MC1K Operation Manual SEI Inspector USB Radiation Detector Apr 3, 2000 How the Inspector Detects Radiation. The Inspector uses a Geiger-Mueller tube to detect radiation. The Geiger tube generates a pulse ofRadiation Alert operation manuals are available in a variety of languages. Ranger EXP External Probe Geiger Counter SEI Inspector Operation Manual The Inspector Alert uses a Geiger-Mueller tube to detect radiation. The Geiger tube generates a pulse of electrical current each time radiation passes through the The IMI Inspector Alert uses a Geiger-Mueller tube to detect radiation. The Geiger tube generates a pulse of electrical current each time radiation passes through