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page -4- Looking at the rolative sensitivity in this way we see that the Lind instrument will detect 3.1 microcuries, but this result is based upon the assumption that all the emanation generated is continually expired. In practice probably not more than 1/8 that forms is expired. On the basis of actual practice then about 25 micrograms of Ra. must be present in the living person to detect it positively by the emanation method as against 10 micrograms Ra, the amount detectable by the gamma ray machine. These deductions when verified by experiment will make it evident that the emanantion in the expired air of a person containing radium in amounts up to 10 or 20 micrograms must be concentrated before it can be detected and estimated quantitatively by the emanantion method. We recommend that 100 to 200 liters of expired air be first dried and then passed thru a U-tube immersed in liquid air to condense the emanation. The emanation thus separated may then be determined quantitatively by drawing it into a calibrated electroscope. A blank experiment should be run by way of control.

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