Proportional Counter Gas Tube from Japan
Proportional counters use gas multiplication for precise radiation spectroscopy in nuclear physics. The gas amplification region creates proportional charge pulses, fitting HTS 8540.89.0020 as gas electron tubes.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
Import Tips
• Window material (mica typical) and gas gain specs required for declaration
• Nuclear regulatory documentation often needed for physics research imports
• Distinguish from sealed detectors by providing operating principle docs