| 摘要 |
A method and apparatus is disclosed for evaluating the linearity of response of a radioactivity dose measurement device over a range of radioactivity dose levels. In accordance with the method, a reference dose of radiopharmaceutical in a container is placed in a central, substantially non-absorptive tube mounted atop a cylindrical spacer with a lead slug coaxial in the tube and positioned below the spacer. This assembly is placed in a measurement chamber of the measurement device, and the response of the device to the unshielded radioactivity is recorded. A succession of leaded shielding sleeves, each having a different known radioactivity attenuation capability, is placed, one at a time, over the central tube. A measurement reading of the device is recorded for indicating the response of the measurement device to the reference dose as shielded by each different sleeve. Multiplication of each response reading by a correction factor, which is a function of the attenuation capability of the sleeve used in obtaining the reading, yields data from which linearity of measurement device response can be easily calculated.
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