Comment on "Development of a gamma ray dose rate calculation and mapping tool for Lagrangian marine nuclear emergency response models" by Little et al

Care must be taken when calculating the sum of released amounts to the environment for different radionuclides of whose physical and chemical characteristics are quite different and the radiological impact of the radionuclides are also quite different. In this comment, the mishandling of summation in "Development of a gamma ray dose rate calculation and mapping tool for Lagrangian marine nuclear emergency response models by Little et al." is pointed out and the correct way is suggested.