[The stability of the properties of electroradiographic plates for medical x-ray diagnosis]. / O stabil'nosti svoistv élektroradiograficheskikh plastin dlia meditsinskoi rentgenodiagnostiki.

The properties of selenium electrocardiographic plates used for the purposes of medical diagnosis are under discussion. The plates are observed to reveal no noticeable traces of fatigue and to retain constant sensitivity to radiation and radiography in the case of the 5 to 10 minutes' interval between obtaining electroradiograms (ERG) during working hours (7 hours). After the technical resource which is equal to 2000 ERG is over, the radiation sensitivity decreases to 10% and defectiveness does not exceed 25%. The actual expiration date of the plates is between 7 and 9 years without worsening of their properties. The quality of the plates stored for a longer time might deteriorate due to the defect which is attributed to crystallization of the selenium layer.