A measuring device includes an ionization chamber where air is contained and a measurement value relating to radiation including a neutron ray and a gamma ray is measured, a detector that detects a detection value relating to the neutron ray, and a controller that calculates a dose of the gamma ray based on the measurement value measured in the ionization chamber and the detection value detected by the detector.

A measuring device includes an ionization chamber where air is contained and a measurement value relating to radiation including a neutron ray and a gamma ray is measured, a detector that detects a detection value relating to the neutron ray, and a controller that calculates a dose of the gamma ray based on the measurement value measured in the ionization chamber and the detection value detected by the detector.

Disclosed is a method for determining .sup.224Ra in a sediment by using a pulse ionization chamber emanometer, which belongs to the technical field of analysis and measurement. A pulse ionization chamber emanometer (PIC), a new emanometer, is used. Based on the half-life characteristics of different radon isotopes, one can separate the .sup.220Rn activity from the total counts by dual counting. The resulting .sup.220Rn measurement then can be used to determine the .sup.224Ra activity in sediment according to the principle of secular radioactive equilibrium.

Disclosed is a method for determining .sup.224Ra in a sediment by using a pulse ionization chamber emanometer, which belongs to the technical field of analysis and measurement. A pulse ionization chamber emanometer (PIC), a new emanometer, is used. Based on the half-life characteristics of different radon isotopes, one can separate the .sup.220Rn activity from the total counts by dual counting. The resulting .sup.220Rn measurement then can be used to determine the .sup.224Ra activity in sediment according to the principle of secular radioactive equilibrium.

A detection device for detecting radiation includes a container including a first portion, a second portion facing the first portion in a first direction, and a side portion extending from the first portion toward the second portion, where a gas is contained in the container, an electron detector located inside the container, where the electron detector detects an electron generated by Compton scattering, a drift electrode located inside the container closer to the second portion than the electron detector and facing the electron detector, and a radiation detector located closer to the second portion than the drift electrode, where the radiation detector detects scattered radiation.

A detection device for detecting radiation includes a container including a first portion, a second portion facing the first portion in a first direction, and a side portion extending from the first portion toward the second portion, where a gas is contained in the container, an electron detector located inside the container, where the electron detector detects an electron generated by Compton scattering, a drift electrode located inside the container closer to the second portion than the electron detector and facing the electron detector, and a radiation detector located closer to the second portion than the drift electrode, where the radiation detector detects scattered radiation.

An asymmetric dual-mode ionization chamber measurement system can include a first high-voltage plate, a second high-voltage plate and a readout plate. The first high-voltage plate can be disposed from the readout plate by a first active volume. The second high-voltage plate can be disposed from the readout plate by a second active volume. A high-voltage potential can be coupled to the first high-voltage plate during a first mode, and to the second high-voltage plate during a second mode. Ion pairs generated by a radiation stream passing through the first active volume during the first mode and the second active volume during the second mode can be measured at the readout plate to determine a radiation rate of the ionizing radiation. The asymmetric dual-mode ionization chamber measurement system can advantageously measure different radiation streams that have significantly different ranges of radiation rates flux.

Various embodiments are described herein for sensors that may be used to measure radiation from radiation generating device. The sensors may use a collector plate electrode with first and second collection regions having shapes that are inversely related with one another to provide ion chambers with varying sample volumes along a substantial portion of the first and second collection regions which provides virtual spatial sensitivity during use.

Various embodiments are described herein for sensors that may be used to measure radiation from radiation generating device. The sensors may use a collector plate electrode with first and second collection regions having shapes that are inversely related with one another to provide ion chambers with varying sample volumes along a substantial portion of the first and second collection regions which provides virtual spatial sensitivity during use.

Radiation detectors and methods of using the radiation detectors that provide a route for surface decontamination during use are described. The detectors utilize light illumination of an internal surface during use. Light is in the longer UV-to-near-infrared spectra and desorbs contamination from internal surfaces of radiation detectors. The methods can be carried out while the detectors are in operation, preventing the appearance of the negative effects of radioactive and non-radioactive contamination during a detection regime and following a detection regime.