We re port on the pre paration of a sta ndard re fe re nce ma te ri a l (S RM) , mad e of s ing le-crystal c hromium-doped corundum (synth e ti c ruby), for use as a n in te ns it y s tandard in e lectron param agne ti c reso nan ce (EPR) ex pe rim e nt s . Th e S B.M ca n be used to measure, b y compari son, th e number of SI)ins in an unknown tes t sa mpl e.
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Chang et al. (1978) studied this question.
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