Interpreting the biological effects of protons as a function of physical quantity: linear energy transfer or microdosimetric lineal energy spectrum?

The choice of appropriate physical quantities to characterize the biological effects of ionizing radiation has evolved over time coupled with advances in scientific understanding. The basic hypothesis in radiation dosimetry is that the energy deposited by ionizing radiation initiates all the consequences of exposure in a biological sample (e.g.

Galactic cosmic ray environment predictions for the NASA BioSentinel mission.

BioSentinel is a nanosatellite deployed from Artemis-I designed to conduct in-situ biological measurements on yeast cells in the deep space radiation environment. Along with the primary goal of measuring damage and response in cells exposed during spaceflight, on-board active dosimetry will provide measurements of the radiation field encountered behind moderate shielding provided by the BioSentinel housing and internal components. The measurements are particularly important to enable interpretation of biological observations but also provide an opportunity to validate integrated computational models used to calculate radiation environments.

Testing the NASA BioSentinel Pixel Dosimeter Using Gamma-ray and Neutron Sources at the LLNL Calibration Lab.

The objective of this paper is to evaluate the accuracy of the NASA BioSentinel Pixel Dosimeter (BPD) using gamma-ray and neutron sources in a standard calibration lab. The dosimeter tested here is the ground-based version of the BPD that will be onboard the BioSentinel mission. The BPD was exposed to radiation from 60Co, 137Cs, and 252Cf at selected distances (dose rates) at the Lawrence Livermore National Laboratory (LLNL) Radiation Calibration Laboratory (RCL), and the results were compared with NIST traceable benchmark values.

Examining the relationship between ethnic identity, depression, and alcohol use among students at historically black colleges/universities (HBCUs).

Alcohol abuse among college populations is a serious public health issue and is associated with many negative consequences; however, few studies have examined the drinking behavior of African American students at Historically Black Colleges/Universities (HBCUs). Alcohol abuse, including binge drinking, has historically been lower among African American than Caucasian college students; however, recent studies indicate that HBCU undergraduates are reporting increased rates of alcohol consumption, raising the question of which potential risk and protective factors are associated with alcohol consumption in this population. Ethnic identity has been identified as one protective factor for ethnic minorities, yet the processes that facilitate this relationship are little known.