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four square centineters. One surface, behind which the
radius salt mixed with a binder is applied, consista of a
thin setal face or window usually about one-tenti millimeter
thick. The thickness of this face is varied to control the
quality of the radiation Uniformity of distribu-
tion of the radium salt, to prevent internal absorption,
and control of the binder, are important in obtaining radia-
tion control. Containers must be gas tight to prevent radon
loss and the face aust be of a notal which has mechanical
strength when produced in form of an extremely thin aheet.
Plaques are applied directly to akin, eye or other parts of
body and radiation covers wide area with shallow penetration.
4. Gamma ray radiography capsules. These capsules
are used for the detection of flaws in metal plates, casting,
and welds. The technique is similar to rediography,
and results in 6 photogreph or shadowgraph of the flaw. The
effectiveness of the rediographic technique depends upon the
presence of an intense, constant source of gamma radiation of
minizum physical dimensions, extreme compactness, proper
geometric shape, and unifora radiation intensity. These prow
perties are obtained by conversion of the padium bromide salt
into a chemical form occupying the sinimum volume for a given
radius concentration, compressing to reduce the volune further,
sealing into an air tight notal capsule of suitable gecmetzio
form thereby assuring the retention of radon gas and the other
decay elements, and finally, sealing the capsule into an outer
-11-
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"ocrText": "four square centineters. One surface, behind which the\nradius salt mixed with a binder is applied, consista of a\nthin setal face or window usually about one-tenti millimeter\nthick. The thickness of this face is varied to control the\nquality of the radiation Uniformity of distribu-\ntion of the radium salt, to prevent internal absorption,\nand control of the binder, are important in obtaining radia-\ntion control. Containers must be gas tight to prevent radon\nloss and the face aust be of a notal which has mechanical\nstrength when produced in form of an extremely thin aheet.\nPlaques are applied directly to akin, eye or other parts of\nbody and radiation covers wide area with shallow penetration.\n4. Gamma ray radiography capsules. These capsules\nare used for the detection of flaws in metal plates, casting,\nand welds. The technique is similar to rediography,\nand results in 6 photogreph or shadowgraph of the flaw. The\neffectiveness of the rediographic technique depends upon the\npresence of an intense, constant source of gamma radiation of\nminizum physical dimensions, extreme compactness, proper\ngeometric shape, and unifora radiation intensity. These prow\nperties are obtained by conversion of the padium bromide salt\ninto a chemical form occupying the sinimum volume for a given\nradius concentration, compressing to reduce the volune further,\nsealing into an air tight notal capsule of suitable gecmetzio\nform thereby assuring the retention of radon gas and the other\ndecay elements, and finally, sealing the capsule into an outer\n-11-"
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