Preliminary design and estimate of capital and operating costs for a production scale application of laser decontamination technology Page: 29 of 34
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Calculation of Decontamination Times:
We begin by calculating the area of the minimum irradiance beam for each
laser using the parameters listed in Table 3 and equation Al:
Area = E (oules)*(Imin)-1*(Dt)y1. (A1)
For 248 nm radiation, Imin is assumed to be 1E08 watts/cm2 whereas it
is assumed equal to 5E08 watts/cm2 for Nd:YAG radiation at 1064 nm.
Next, the time to decontaminate a tank is estimated using equation A2.
T = (np * A)/(R *a) (A2)
where:
T = time needed for decontamination if lasers used at minimum irradiance,
A = Area of tank = 4.09 m2 (sum of the interior and exterior surface areas)
R = laser repetition rate
a = area irradiated by a single pulse at minimum irradiance
np = number of pulses needed to decontaminate minimum irradiance area.
In calculations using equ. A2, "np" is set equal to 15. This somewhat
arbitrary choice is made because real applications of laser
decontamination technology require overlapping pulses onto an elementary
area and revisiting areas previously treated to ensure that all
contamination is removed. This particular choice is consistent with
experimental work in our laboratory that shows effective decontamination
at an irradiance close to the estimated minimum at 248 nm. Since our
experimental evidence suggests that raising the irradiance above the
minimum value increases the amount of material ablated (see Figs. Al and
A2) in a roughly linear fashion, we can modify equation A2 to
T = [(np * A)/(R *a)J *[I/min] (A 3)
accommodate these facts (A3).23
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Pang, Ho-ming & Edelson, M. C. Preliminary design and estimate of capital and operating costs for a production scale application of laser decontamination technology, report, August 6, 1994; Iowa. (https://digital.library.unt.edu/ark:/67531/metadc613734/m1/29/: accessed May 4, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.