TradeVerify Selenium 74 abundance 99.95%isotopic purity no less than 99.95%chemical purity no less than 99.98%the substance is used mainly in biochemical studies as tracer and in production of material for metal crack detection.?Our company specializes in rare material supplying and trading. products that we sell includes Selenium 74, Iridium 192, Osium 187, Samarium 149, Rhodium 103, Holmium 165, Cu 63, Cu 65.We have large stockpile of above mentioned products and we are upstream supplier of many resellers as well. We welcome all serious buyers come to negotiate with us.