A study was done to determine the degree of radiation protection afforded by various types of prescription lenses, including commercially available lead glasses. A wide variation in measured attenuation was found. Two commonly available types of prescription lenses were found to provide greater than 92% attenuation of the x-ray beam generated at 108 kVp.

The methodology of blood sample preparation and analysis has been examined to further evaluate the technique of electron spin resonance (ESR) for possible use in detecting cancer and in monitoring the progress of cancer therapy. Frozen whole blood and serum samples from 278 normal donors and 97 cancer patients were studied by ESR for signal intensity from Cu+' bound to ceruloplasmin (g factor = 2.05). The signal from this species (Cu+'-CP) in serum rose sharply during the first two hours of storage at room temperature after being drawn from the subject, and then reached a plateau. The average Cu+'-CP ESR signal intensity was significantly different for control groups of males, females not taking estrogen medication, and females taking estrogens. The mean ESR signal intensities of Cu+'-CP from cancer patients separated into the same groups as the control data were approximately twice as great as the mean control levels. Total serum copper levels were correlated with ESR intensities of Cut2-CP and indicated that the ratio of Cu+'/Cuf' in CP is higher in serum from cancer patients than from controls. diseases as compared with control samples. It was also shown that there was a reduction in signal level over the course of treatment with radiotherapy. Foster et aLs described experiments in which they recorded ESR signals with g-values of 2.049 and 4.2 from frozen human whole blood samples. In a comparison between samples from 26 control subjects and 63 cancer patients, these authors demonstrated that the mean ESR level, at g = 2.049 of the cancer patients was significantly higher.

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The dose distribution pattern from a Delta-25 head scanner was evaluated experimentally in a 17.5-cm-diam cylinder water phantom for different scan speed and slice thickness combinations. TLD chips were used to measure the dose at different points across the scan section. The isodose curves thus obtained were found to be asymmetric, with the regions of maximum and minimum dose near the surface on the opposite sides of the phantom. The effect of changing the scan thickness and speed on dose was evaluated and a linear increase in dose with the increase of slice thickness was observed. This was consistent with the design of the line focus and the beam collimators used in this system. The effect of multiple slice scan on the dose was also evaluated.

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