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Thanks for consulting at my virtual clinic HCM. I have carefully worked through your case, and can well realize your health worries. Being your physician, I want to assure, I will take care all of your medical concerns.
Yes until mid-twentieth century (starting from early 1930s) it remained in use in diagnostic radiology of different parts of the body and perhaps Cardiac imaging too for the reason of its ability of giving very detailed images and immensely longer half life after the injection.
No, there are very little to NO chances of showing up and detecting the drug in the system as it must have surpassed up til now. It remains in the biological tissues for upto 18 years or so. And it was not used anymore in any country after 1950s for sure. There was very little known about the alpha radiations activity of Thorotrast in 1930s, that's why it remained in use for a couple of decades. But soon after realization never used after 1950s and patients were saved from radioactive hazards.
Other techniques like Thallium Scan and
Angiography,
Echocardiography and other sophisticated and safer diagnostics were introduced that largely replaced the Thorotrast
radiography.
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Regards!
DR. MUHAMMAD HANIF
USA