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Gamma and X-Ray Standards

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A wide range of gamma and x-ray standards for research and educational use are available in the energy range of 5.9 to 2614 keV. Many nuclides are available up to 100 µCi (3.7 MBq) to allow for the lower efficiencies of detection inherent in many instruments. Available activity ranges are listed for each nuclide in the tables on pages 46 to 53. 

Gamma Standards—Type C
The type C configuration can be used to check the performance of G.M. and NaI (TI) detectors. The maximim activity of this source type is 10 µCi (370 kBq). Please call customer service for a quotation.

Gamma Standards—Type D
The type D configuration is mainly used for checking the performance of G.M. and NaI(Tl) detectors. The type D disk is a 1” (25.4 mm) diameter by 0.250” (6.35 mm) thick disk constructed of high strength plastic. The active diameter is 0.197” (5 mm).

Gamma Standards—Type M
The type M thin “scatterless” disk is used in applications involving high resolution solid state detectors. The activity is deposited on 9 mg/cm2 aluminumized Mylar (polyester) disk, and covered with 0.9 mg/cm2 Kapton (polymide). The source is supplied in a removable aluminum holder. In the holder the source has an overall diameter of 1” (25.4 mm) and a thickness of 0.125” (3.18 mm). Out of the holder the source is 0.937” (23.8 mm) in diameter with a thickness of approximately 0.030” (0.76 mm). The active diameter is 0.12” (3 mm).

Gamma Standards—Type R
The type R rod is used for calibrating well type NaI(Tl) detectors. It is constructed of high strength plastic and is offered in three sizes: 5” high x 0.625” diameter (127 mm x 15.9 mm), 5” high x 0.5” diameter (127 mm x 12.7 mm) and 2.95” x 0.5” diameter (74.9 mm x 12.7 mm). The active diameter of the rod standard is 0.187” (4.75 mm).

Gamma Standards—Type T
The type T plastic test tube is used in clinical instrument calibrations. Each polypropylene tube contains 0.75 mL of active epoxy with the balance of the tube filled with cold epoxy. Tube sizes are 2.95” high x 0.472” diameter (75 mm x 12 mm) or 2.17” high x 0.472” diameter (55 mm x 12 mm).

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