Vitamin D Effective UV Dosimetry

The action spectrum for the synthesis of pre-vitamin D3 shows that only the short wavelength UV is effective (CIE, 2006) for this process. This action spectrum can be approximated by the spectral response of polysulphone (CIE, 1992). Using polysulphone dosimeters, the transmission of pre-vitamin D3 effective UV through clothing has been investigated (Hutchinson and Hall, 1984; Parisi and Wilson, 2005). Many factors influence the UV exposure to an individual, and therefore, the synthesis of pre-vitamin D3, including clothing, use of sunscreen, pigmentation of the skin, age, and latitude of residence (Matsuoka et al., 1990; 1992; Webb, 2006). The face, arms, and hands contain approximately 15% of the skin area of the human body. UV exposure of 1 MED to these parts would produce serum vitamin D equivalent to 1,500 IU - 3,750 IU (Samanek et al., 2006). Most research conducted on UV transmission through clothes is generally from the perspective of protection from UV; however, some of the incident UV can transmit through clothing and has been measured at various body sites under garments with polysulphone dosimeters for pre-vitamin D3 effective UV (Parisi and Wilson, 2005).

This work can be extended for the quantification with polysulphone dosimeters of pre-vitamin D3 effective UV to humans in different environments. Figure 7.6 shows a typical calibration curve for pre-vitamin D3 effective UV in winter at a sub-tropical site.

40001-

40001-

Delta A

Figure 7.6 Calibration of polysulphone dosimeters for pre-vitamin D3 effective UV exposures on a winter's day (Parisi and Turnbull, 2006)

Delta A

Figure 7.6 Calibration of polysulphone dosimeters for pre-vitamin D3 effective UV exposures on a winter's day (Parisi and Turnbull, 2006)

Was this article helpful?

0 0

Post a comment