ANSI N42.27-1999 pdf download American National Standard for Determination of Uniformity of Solid Gamma-Emitting Flood Sources
1.1 Scope
The scope of this standard is limited to commercially-produced, solid radioactive flood sources intended to aid in the determination of the system field uniformity of scintillation cameras used in nuclear medicine.
This standard is intended to provide a set of minimum informational requirements for a Test and Measurement Report for flood sources used with scintillation cameras. It is not intended to specify the means by which such information is obtained, although it does place requirements and limitations on the methodology.
In addition, it is not intended to cover the use of the source in the determination of the operating characteristics or correction factors for a scintillation camera.
1.2 Special word usage
The words shall or must indicate a procedure that is necessary to meet the requirements of this standard. The words should or may indicate an advisory recommendation that is to be applied when practicable.
2. References
This standard shall be used in conjunction with the following publications. If the following publications are superseded by an approved revision, the revision shall apply.
ASTM E456-96, Standard Terminology for Relating to Quality and Statistics.
NEMA NU 1- 1994, Performance Measurements of Scintillation Cameras.
3. Definitions
For the purposes of this standard, the following terms and definitions apply:
3.1 accuracy: The closeness of agreement between a test result and an accepted reference value. (The word “accuracy” is to be understood as it is defined in ASTM E456-96.)
3.2 penumbra: The area over which the sensitivity of the measurement system falls from 90% of its maximum value within the unit cell to 10% of that value.
3.3 statistical terminology: See: accuracy and uncertainty.
3.4 uncertainty: An indication of the variability associated with a measured value that takes into account two major components of error: 1) bias, and 2) the random error attributed to the imprecision of the measurement process. (The word“uncertainty” is to be understood as it is defined in ASTM E456-96.)
3.5 uniformity: A quantitative description of the two-dimensional distribution of the photon flux emitted by a radioactive flood source, describing variations in that flux for specified areas.