Vitamin D levels after UVB radiation: effects by UVA additions in a randomized controlled trial.

Background: Ultraviolet B (UVB) radiation increases the serum level of 25-hydroxyvitamin D [25(OH)D]. However, the impact of UVA on vitamin D synthesis by UVB is poorly understood clinically.

Objective: To examine how different combinations of UVA and UVB radiation affect S-25(OH)D for the same vitamin D-weighted exposure.

Experience from long-term monitoring of RAKR ratios in (192)Ir brachytherapy.

Background: Ratios of values of brachytherapy source strengths, as measured by hospitals and vendors, comprise constant differences as, e.g., systematic errors in ion chamber calibration factors and measurement setup.

Dosimetry of anal radiation in high-dose-rate brachytherapy for prostate cancer.

Purpose: The objective of this study is to determine the radiation dose to the anus during brachytherapy using high-dose-rate Ir-192 sources.

Methods And Materials: Thermoluminescence dosimeters were used for measuring the dose to the distal part of the anus in 10 patients, and in a prostate phantom to measure the radiation dose during the transport of the radiation source.

Results: The measured dose to the anus in vivo was on average 0.