A Method for the Determination of Radium in Ores and Residues
- New Brunswick Laboratory (NBL), New Brunswick, NJ (United States)
A method for the determination of the radium content of ores and uranium processing residues (K-65) has been developed. Samples were packed into 12 ml, glass vials, the vials sealed and the gamma ray activity of the radium detected after a growth period of 30 days. A high pressure ionization chamber was used as a detector and the gamma rays were filtered through 3/8 inch of lead to minimize the defection of the low energy part of the radium gamma ray spectrum. The large sample size used in the method decreases the importance of sample inhomogeneity. Corrections are applied for UX and actinium series gamma rays, and for absorption of radium gamma rays in the sample material and in the aqueous radium standard. The magnitude of the correction for the self absorption of radium gamma rays in the sample material was evaluated by using three methods. In the first method, synthetic standards containing known quantities of radium were used. In the second, the slope of the curve for ion current per gram of sample as a function of the number of grams contained in 12 ml, vials was calculated for a large number of samples. In the third, the absorption of radium gamma rays by representative ores and residues was determined by using a radium source and a sodium iodide crystal scintillation counter. The radium content of a homogeneous sample can be established with a precision equivalent to a standard deviation of ±0.1 to 0.4 percent.
- Research Organization:
- New Brunswick Laboratory (NBL), New Brunswick, NJ (United States)
- Sponsoring Organization:
- US Atomic Energy Commission (AEC)
- NSA Number:
- NSA-11-005781
- OSTI ID:
- 4352739
- Report Number(s):
- NBL--128
- Country of Publication:
- United States
- Language:
- English
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