PURPOSE Thermoluminescent dosimeters are used routinely for dosimetric measurements of photon and electron fields. However, no work has been published characterizing TLDs for use in combined photon and electron fields. This work investigates the response of TLD-100 (LiF:Mg,Ti) in mixed fields of photon and electron beam qualities. METHODS TLDs were irradiated in a 6 MV photon beam, 6 MeV elec...

ABSTRACT In the late 1950s it was recognized that levels of atmospheric radiocarbon ( 14 C) had not been constant over time. Since then, researchers have sought to document those changes, initially through measurements known age tree rings and more recently using other archives create curves correct or calibrate ages calendar ages. This paper highlights some, but by no means all, efforts extend...

In an undergraduate bioanalytical instrumental lab, students use capillary electrophoresis to quantify L-ascorbic acid (vitamin C) in food samples. The students are tasked to prepare standards, to obtain the calibration curves, and to determine the quantity of L-ascorbic acid in tomato samples (Lycopersicon fruit). A discussion about the function of each component of a capillary electrophoresis...

Thin films of analyte-specific hydrogels were combined with microfabricated piezoresistive pressure transducers to obtain chemomechanical sensors that can serve as selective biochemical sensors for a continuous monitoring of metabolites. The gel swelling pressure has been monitored in simulated physiological solutions by means of the output signal of piezoresistive sensors. The interference by ...

Recently, photon-counting detectors capable of resolving incident x-ray photon energies have been considered for use in spectral x-ray imaging applications. For reliable use of energy-resolved photon-counting detectors (ERPCDs), energy calibration is an essential procedure prior to their use because variations in responses from each pixel of the ERPCD for incident photons, even at the same ener...

This paper describes high-resolution autocollimator calibration system in NMIJ. A goniometer system with nano-radian resolution provides precision rotation angles of a mirror attached on the rotation axis and rotation angles read by an autocollimator are compared to the set angles. The rotation angle is detected by a highprecision angle interferometer that observes motions of corner reflectors ...