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Resolution in EM autoradiography V: 45Ca (and 33P).

We devised a specimen to test EM autoradiographic resolution for calcium-45 (and phosphorous-33). A dry emulsion film was used for soluble compounds. We obtained a resolution (HD) value of 2300 +/- 500 A. This value is no larger than that previously obtained for Carbon -14, whose emission is about 1.6-fold lower. This result is as expected on theoretical grounds.