. Radiography, X-ray therapeutics and radium therapy . Fig. 204.—Comparing the wet strip with thestandard scale, usinsr the slide. Pig, 205.—Comparison of the dry stripwithout the slide. standard scale. If it took ten minutes to produce tint No. 5, then it willrequire another two minutes to bring it to tint No. 6 ; or if it took nineminutes to impart to the strip the colour of tint No. 6, it will take anothersix minutes exposure to bring it to a colour similar to tint No. 10 (providedthat the condition of the tube has not altered materially). As it is not possible to read the value of the dose
. Radiography, X-ray therapeutics and radium therapy . Fig. 204.—Comparing the wet strip with thestandard scale, usinsr the slide. Pig, 205.—Comparison of the dry stripwithout the slide. standard scale. If it took ten minutes to produce tint No. 5, then it willrequire another two minutes to bring it to tint No. 6 ; or if it took nineminutes to impart to the strip the colour of tint No. 6, it will take anothersix minutes exposure to bring it to a colour similar to tint No. 10 (providedthat the condition of the tube has not altered materially). As it is not possible to read the value of the dose directly from the quanti-meter strip during the irradiation, it is advisable to measure the dose at thesame time by observing the milliamperemeter, and timing the duration witha watch, or it may be checked by using at the half-distance a Sabouraudpastille. A second pastille may be placed on the skin and checked by meansof a Hampson or Lovibond radiometer. 286 RADIATION THERAPEUTICS If it is desired to ascertain the quantity of X-rays which have
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