ABSOLUTE COUNTING OF $beta$-PARTICLES. (THE METHOD OF THE ABSOLUTE SOLID ANGLE AND THE "4 $pi$-COUNTER" METHOD)
Journal Article
·
· Trudy Vsesoyuz. Nauch. Issledovatel. Inst. Metrol.
OSTI ID:4843615
The installation for the absolute counting of beta particles by he method of absolute solid angle consists of a brass box aluminum-coated inside. The detector, a cylindrical counter, has a window closed with a thin (0.04 mg/cm/ sup 2/ collodion film on its side surface. The source 0.1 mg/cm/sup 2/ thick is applied to the collodion film. The box is filled with helium (with an addition of ethyl alcohol vapors) under pressure of 17--20 mm Hg. In the 4 pi -counter method two types of installations are used. In the first type the 4 pi -counter consists of two cylindrical counters 40 mm in diameter and 80 mm long with the source placed between them. The secondtype consists of two semicylinders 80 mm high and 80 mm in diameter with a tungsten filament 0.1 mm in diameter. The source is placed between the semicylinders. The 4 pi -counter is placed under a glass hood, evacuated, and filled with the ethyl alcohol (10%) and pure argon (90%) mixture. The measurement error is 2%. The method of weighing radioactive compounds necessary for the absolute counting of beta particles is described, and measurement errors of both methods are considered. A comparison of the methods shows that the 4 pi -counter method has advantages as compared with the method of absolute solid angle. (Referat. Zhur., Elektrotekh., No. 12, 1959).
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-15-027829
- OSTI ID:
- 4843615
- Journal Information:
- Trudy Vsesoyuz. Nauch. Issledovatel. Inst. Metrol., Journal Name: Trudy Vsesoyuz. Nauch. Issledovatel. Inst. Metrol. Vol. Vol: No. 30, (90)
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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