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PART I.
EXPERIMENTAL
3
OUTLINE
1.
Gamma Ray Method of Detecting Radium.
ao
Procedure and precautions in conducting tests.
b. Testing of different types of instruments: (1) Wulf quartz
fiber; (2) Schibidt electroscope; (3) Lind types.
f
2.
Test for Radioactivity of Expired Air.
ae
Electroscopic method for radon, and thorone
b.
Sci tillation methods
3.
Tests for Radioactivity of Excreta-Urine and Faeces Residues.
a.
By comparison of alpha ray activity of films.
b.
By determination of radium--emanation method.
4.
Discussion: Comparison of Sensitiveness of the Different Methods.
GAMMA RAY
METHOD
In the general run of measurements in radioactivity the gamma-ray method is
associated with the rating of commercial samples of radium and mesothoriume The
amounts of radium compared are relatively large--being expressed in milligrams.
Hence on first thought one would probably not consider the gamna-ray method at all
suited for detecting small quantities of radium of the order of micrograms; but
after employing the gamma-ray method for two years alongside of methods involving
the measurements of effects produced by alpha rays, wa have reached the conclusion
that gamna-ray measurements when carefully controlled offer a reliable and rapid
method for detecting amounts of radium in living persons as low as five micrograms,
and in the hands of an experienced man working under carefully controlled conditions,
t
a still smaller quantity will give a positive test.
two N then mingam
t
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"ocrText": "PART I.\nEXPERIMENTAL\n3\nOUTLINE\n1.\nGamma Ray Method of Detecting Radium.\nao\nProcedure and precautions in conducting tests.\nb. Testing of different types of instruments: (1) Wulf quartz\nfiber; (2) Schibidt electroscope; (3) Lind types.\nf\n2.\nTest for Radioactivity of Expired Air.\nae\nElectroscopic method for radon, and thorone\nb.\nSci tillation methods\n3.\nTests for Radioactivity of Excreta-Urine and Faeces Residues.\na.\nBy comparison of alpha ray activity of films.\nb.\nBy determination of radium--emanation method.\n4.\nDiscussion: Comparison of Sensitiveness of the Different Methods.\nGAMMA RAY\nMETHOD\nIn the general run of measurements in radioactivity the gamma-ray method is\nassociated with the rating of commercial samples of radium and mesothoriume The\namounts of radium compared are relatively large--being expressed in milligrams.\nHence on first thought one would probably not consider the gamna-ray method at all\nsuited for detecting small quantities of radium of the order of micrograms; but\nafter employing the gamma-ray method for two years alongside of methods involving\nthe measurements of effects produced by alpha rays, wa have reached the conclusion\nthat gamna-ray measurements when carefully controlled offer a reliable and rapid\nmethod for detecting amounts of radium in living persons as low as five micrograms,\nand in the hands of an experienced man working under carefully controlled conditions,\nt\na still smaller quantity will give a positive test.\ntwo N then mingam\nt"
}