A 54-year-old Ukrainian woman attempting to cross into Poland was stopped after border guards discovered a $100 bill emitting radiation at levels 1,905 times higher than the natural background. As reported by Polish media outlet RMF24, the incident occurred at the Medyka border crossing during a routine security check.
The woman was carrying nearly $10,000 in cash, intending to purchase a car in Poland. However, as she passed through the radiometric border gates, sensors immediately triggered an alarm, indicating the presence of an active ionizing radiation source. Border guard officers responded swiftly, isolating the traveler and conducting a thorough manual inspection of her belongings using portable radiation detectors.
The detailed search revealed that the intense radiation was not coming from a hazardous cargo or chemical substance, but from a single 100-dollar banknote. Measurements confirmed that the item exceeded the permissible natural radiation background by a staggering 1,905 times. Following the alarming discovery, the dangerous bill was immediately confiscated and placed inside a specialized protective lead container to prevent exposure to staff and other travelers.
To determine the exact nature of the radioactive contamination, Polish border authorities consulted with the National Atomic Energy Agency. Their expert analysis concluded that the isotope present on the banknote is typically used for medical purposes, likely in diagnostic imaging or oncological treatments.
Despite her explanation that the funds were simply meant for buying a vehicle and that she had no malicious intent, strict European security protocols left no room for exceptions. Citing national security and health concerns, border officials denied the woman entry into Poland and returned her to Ukraine, along with the seized contaminated banknote.
The Medyka crossing, one of the busiest checkpoints between Ukraine and Poland, is equipped with state-of-the-art radiometric portals designed to detect even the slightest traces of illicit nuclear or radioactive materials. Such stringent measures are essential to combatting cross-border smuggling and ensuring national security. When a medical isotope accidentally contaminates personal belongings like currency—often through sweat or direct contact by a patient recently treated with radiotherapy—it triggers the same alarms as more nefarious materials. Consequently, travelers must be aware of the high sensitivity of border scanning equipment, as any radioactive anomaly will lead to immediate isolation and investigation.
Polish authorities noted that this is not an isolated incident. In December 2025, a similar case occurred when a Polish citizen was caught attempting to cross the border from Ukraine with a radioactive banknote among his currency and was similarly turned back. Experts advise individuals who have recently undergone medical treatments involving radioactive isotopes to carry appropriate medical documentation when traveling internationally. Furthermore, they should avoid close physical contact with items like cash that will be scrutinized at customs, ensuring their travel plans remain uninterrupted.