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Summary  

The exact probability density function for paired counting can be expressed in terms of modified Bessel functions of integral order when the expected blank count is known. Exact decision levels and detection limits can be computed in a straightforward manner. For many applications perturbing half-integer corrections to Gaussian distributions yields satisfactory results for decision levels. When there is concern about the uncertainty for the expected value of the blank count, a way to bound the errors of both types using confidence intervals for the expected blank count is discussed.

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the thermal diffusivity of the sample. Fig. 2 Sensor and sample temperature increase curves In Eqs. 4 and 5 , P 0 is the total output power, L 0 is the modified Bessel

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power and D s ( τ ) is the geometric function given by the relation 27 in which L 0 is the modified Bessel function and l , k are the dimension of the resistive pattern. To record the potential difference variations, which normally are

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