A radiation physicist who coauthored NIST tables of mass attenuation coefficients and mass energy-absorption coefficients with Stephen M. Seltzer. The tables connect X-ray and gamma ray photon energy to interactions in elements and mixtures. They distinguish removal of photons from a beam from absorption of their energy, a difference needed when calculating shielding or deposited radiation energy.[ref]
Tables of X-Ray Mass Attenuation Coefficients and Mass Energy-Absorption Coefficients by John H. Hubbell and Stephen M. Seltzer. Database abstract: attenuation and energy-absorption tables for elements and radiological mixtures
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John H. Hubbell is not a widely recognized figure in popular culture or history. However, there is a notable entity known as Hubbell Incorporated, founded by a person named Harvey Hubbell II. It's important to clarify the context or provide additional information about what you're referring to as "John H. Hubbell," as it could relate to a specific individual in a niche field, a fictional character, or even a misspelling of another name.