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铱-192在国外,已相当普遍的用于射线探伤工作,在我国目前应用极少。其主要原因是它半衰期短—仅74天。这就经常需要更新射源,目前原子能所已经能够供应铱-192射源,而且生产容易,成本低。这为我们广泛使用它提供了有利条件。放射性同位素种类繁多,但在无损检验中应用它,由于受到半衰期、能量、放射性比度等的限制,实际能使用的很少。在我国电力系统中,应用γ射线探伤已经有很久的的史了。大家对钴-60和铯——137应用已很熟悉,最近又开始使用铕-152+154,这些射源半衰期较长。C_0~(60)和C_S137放射的γ射线的能量较高,适合于透照较厚的部件。而铱-192放出的γ射线与400KeV的X射线相似,透照较薄的工件特别有效。
Iridium-192 in foreign countries, has been quite common for ray inspection work, very few applications in our country. The main reason is its short half-life - only 74 days. This often requires a more retrofit source. At present, IAEA has been able to supply iridium-192 sources with ease of production and low cost. This provides favorable conditions for us to use it extensively. A wide range of radioisotopes, but its application in non-destructive testing, due to the half-life, energy, radioactivity ratio restrictions, the actual can be used very little. In China’s power system, the application of γ-ray detection has a long history. Members are already familiar with cobalt-60 and cesium-137 applications and recently started using europium-152 + 154, which has a longer half-life. The γ-rays emitted by C_0 ~ (60) and C_S137 have high energy and are suitable for transillumination of thicker parts. The γ-rays emitted by iridium-192 are similar to the 400-keV X-rays and are particularly effective when penetrating thinner workpieces.