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Caption : figure s1. panels showing wipes prototyped and tested for dust pick up and xrf response: figure s1 (a). panel showing images of a subset of the wipes prototyped and tested for dust pick up and xrf response; figure s1 (b). average masses of house dust picked up by different wipes when a mass of 0.100 g of house dust was used to dose an area of 1 ft2<sup></sup>. painter’s tape picks up an average mass of 0.095 g of house dust; figure s1 (c). average xrf reading from 3 trials of picking up 0.1 g of 100 ppm pb paint dust (10 μg of pb). the error bars represent the standard error of the mean from 3 trials.

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Caption : figure s2. average xrf reading corresponding to the use of portions of painter’s tape with different sizes to pick up 0.1 g of 100 ppm pb paint dust (10 μg of pb). the higher of the two xrf readings obtained from the top side and bottom side of the folded tape was reported in each instance. it must be noted that all the sizes tested here successfully picked up all 0.100 g of the pb paint dust. the error bars represent the standard error of the mean from 3 trials.

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Caption : figure s3. graph showing the decrease in xrf reading with increasing distance from pb dust standard sample known to read (500 ± 50) ppm pb. the distance was introduced by means of stacked sheets of paper between the xrf reading window and the dust sample. each sheet of paper measured 0.1 mm in thickness.

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Caption : figure s4. overlay of a raw xrf spectrum for a tape with 10 µg pb (dashed line) and a raw xrf spectrum for a blank tape (dotted line). the emission energy range shown on the x-axis has been limited to the region of interest around the characteristic pb emission energy of 12.61 kev (red dotted line).