. Radiography, X-ray therapeutics and radium therapy . Vic. 206. —Plain strips, exposed and developed. Dose atdepth of 1 Envelopescontaining strip andarranged medium Fig. 207.—Strips exposed with 1 and developed. which are obtained onstrips exposed under ablock of aluminium 10mm. thick. In this waythe action on the strip islessened and the latterdoes not become so dark,although large doses aregiven. Quantities up to30 or 40 x can be con-veniently estimated. The comparison, develop-ment, etc., of the stripsis exactly the same as ifthe 10 mm. aluminiumwere not used. The dosewhi
. Radiography, X-ray therapeutics and radium therapy . Vic. 206. —Plain strips, exposed and developed. Dose atdepth of 1 Envelopescontaining strip andarranged medium Fig. 207.—Strips exposed with 1 and developed. which are obtained onstrips exposed under ablock of aluminium 10mm. thick. In this waythe action on the strip islessened and the latterdoes not become so dark,although large doses aregiven. Quantities up to30 or 40 x can be con-veniently estimated. The comparison, develop-ment, etc., of the stripsis exactly the same as ifthe 10 mm. aluminiumwere not used. The dosewhich the strip thenshows is that which hasbeen applied at the sur-face, and not, as is some-times assumed, that whichhas reached 10 cm. strips should be compared with the standard scale and arecord kept of all exposures given, with the total dose for each complete Dose .it Dose at 1cm. depth Dose at 3em. depth
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