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Not bikini or Fukushima. C137 is THE industrial isotope for gamma ray production. It’s used in a host of industries. Oil and gas for one, food sterilization aka irradiated foods( fruit, veggies and meats) the EU has irradiation mandates. Medical sterilization of instruments and devices as well.

[Cesium-137 (Cs-137) is used in medical therapy (cancer treatment), industrial gauges (thickness, density, flow measurement in pipes/soil), food irradiation (sterilization/preservation), radiation detection calibration, radiometric dating, and environmental tracing of soil movement, leveraging its consistent gamma radiation and long half-life]

The list is long.

[Medical Uses

Cancer Therapy: Used in sealed sources for brachytherapy (internal radiation) and external beam radiotherapy to target and destroy cancer cells.

Sterilization: Irradiates medical equipment and supplies to kill pathogens.

Industrial & Scientific Uses

Gauge Calibration: Calibrates radiation detection equipment like Geiger counters.

Thickness Gauges: Measures thickness of paper, metal sheets, or photographic film.

Density/Moisture Gauges: Measures soil compaction in construction and moisture content.

Flow Meters: Detects liquid flow in pipes and boreholes.

Radiometric Dating: Helps determine the age of materials.

Scintillation Counters: Used in compounds (like CsI) to detect radiation.

Environmental & Other Applications

Food Irradiation: Sterilizes food, kills germs, delays ripening, and extends shelf life.

Soil Erosion Studies: Acts as a tracer to identify soil movement and deposition.]

All it takes is for any one of these industrial users to illegally dump a Cesium source rod into a landfill or worse into a watershed and everything down steam is now going to be laced with cesium as it leaches into the water supply.

China and India are notorious for having cesium and other radioisotope in the wild and dumped all over the place and into the oceans too.