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some foods (and other things, like blood and some other medical products) are irradiated in order to sterilize them and make them last longer, 137Cs sources are used for this purpose because this material is easily available but can't be used for other purposes (like radiography)
But it doesn't exactly explain how the cs-137 contaminated the shrimp. Usually when irradiating anything the source is quite decoupled from the target.
This story is sorr of getting weird
the source getting damaged or corroded somehow is the simplest explanation i can think of now, cesium is likely in form of chloride which is very easily soluble in water
or maybe it was intentional sabotage by competitor, who the fuck knows
https://en.m.wikipedia.org/wiki/Tetramethylenedisulfotetramine
Smaller sources for sensing and detection are ceramic. Cobalt is preferred for larger sources but the half life is only ~5 years so I'm sure there are plenty of applications where the solubility of CsCl is outweighed by the 30 year half life.
CsCl is also much less active per gram because about half of fission product cesium is stable (on top of longer halflife)