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Revised Parameters for Use in Loevinger's Beta Point-Source Dose-Distribution Function

Bhabha Atomic Research Centre, Trombay, Bombay, India

Correspondence: For reprints contact: G. Venkataram, Division of Radiation Protection, Bhabha Atomic Research Centre, Trombay, Bombay-400 085, India.

ABSTRACT

Even though extensive data in tabular form on beta point-source dose-distribution in water and air have been made available by Cross and Berger, Loevinger's beta point-source dose-distribution function is the only equation available in an analytical form that can be used to calculate the dose from extended sources. However, constants employed in this equation were based on scanty experimental data which were available in the 1950s. it was seen that Loevinger's original parameters give fairly accurate dose distribution values for beta emitters of maximum energy less than 1 MeV, while for high energy emitters the dose values using the original constants were less by about 20% compared with Cross's values. Hence, the parameters in Loevinger's equation have been reevaluated for high-energy beta emitters.

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				REFERENCES J. ICRU, December 1, 2004; 4(2): 165 - 175. [Full Text] [PDF]