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August 29th, 1928. Dear Dr. Schlundt: I am sending you two (2) specimens of sinc for use in testing the sensitiveness of detecting small quantities of radon by means of a zinc sulphide screen. I would suggest that you examine both of these specimen carefully for any trace of self luminosity, prior to introducing any radium to derect its presence. You realize these specimen of necessity have been around a radium laboratory, and while I feel confident that they do not contain any radio- active material, still there is always a possibility of contamina- tion. Cordially yours, HHBarker: RH

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    "ocrText": "August 29th, 1928.\nDear Dr. Schlundt:\nI am sending you two (2) specimens of sinc\nfor use in testing the sensitiveness of detecting small quantities\nof radon by means of a zinc sulphide screen.\nI would suggest that you examine both of these\nspecimen carefully for any trace of self luminosity, prior to\nintroducing any radium to derect its presence. You realize\nthese specimen of necessity have been around a radium laboratory,\nand while I feel confident that they do not contain any radio-\nactive material, still there is always a possibility of contamina-\ntion.\nCordially yours,\nHHBarker: RH"
}