Emission spectroscopic analyzer

An emission spectroscopic analyzer comprising:

• exciting means for exciting a radioactive material to be analyzed to emit light, said exciting means being enclosed in a radiation shielding wall;
• detecting means for detecting the emitted light, said detecting means being located outside the radiation shielding wall;
• light-transmitting means having a first end disposed at the exciting means and having a second end disposed at the detecting means, said light-transmitting means for transmitting the emitted light, impinging on the first end of the light-transmitting means, to the detecting means as light having been transmitted through the light-transmitting means and emitted from the second end of the light-transmitting means, said light-transmitting means penetrating a hole made in the radiation shielding wall having a sealing structure to prevent radiation leakage, the light-transmitting means penetrating the hole with curvature;
• a lens system for detachable connection to the second end of the light-transmitting means to permit visual observation of the emitted light therethrough;
• and
• a fine adjustment device for adjusting the position of the first end of the light-transmitting means in relation to the emitted light from the material to be analyzed;
• wherein the light-transmitting means is an image guide formed of a bundle of a plurality of optical fibers in which the position of each optical fiber in relation to other optical fiber at one end of the image guide exactly corresponds to that position of each optical fiber in relation to other optical fibers at another end of the image guide, the bundle of optical fibers being comprised of plural silica glass fibers fused together to form a single unit, each silica glass fiber having a core section of pure silica and a cladding section surrounding the core section and made of silica glass having a refractive index less than the refractive index of the core section, and wherein the second end of the light-transmitting means is arranged to be detachably mounted to the detecting means so that the lens system may be attached to the second end of the light-transmitting means when the second end is detached from the detecting means for viewing of images transmitted through the light-transmitting means, whereby the optimum position of the first end of the light-transmitting means may be adjusted with the fine adjusting device to view a desired image through the lens system and upon viewing of the desired image, the lens system may be detached from the second end and the second end of the light-transmitting means may be attached to the detecting means for detecting emitted light of the desired image.