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1954 Brit. Jrnl. Radiol. 27 247/1 The value is 30 millirad per week.

1973 Times 31 July 5/4 He said a total dose of 0·1 of a millirad—one-third of the normal background radioactive level—had been recorded during the 21 hours following the blast.

1989 C. Caufield Multiple Exposures (1990) xiv. 145 Some of the X-ray devices used in the mass screening..were delivering skin doses of between 2,000 and 3,000 millirads.