An example smoke detector includes (i) a chamber; (ii) a first electrode disposed within the chamber; (iii) a second electrode disposed within the chamber, wherein gas is disposed in an inner space of the chamber between the first electrode and the second electrode; (iv) a radioactive source generating alpha particles within inner space of the chamber; and (v) a magnet coupled to the chamber, where the magnet generates a magnetic field in the inner space of the chamber.

An example smoke detector includes (i) a chamber; (ii) a first electrode disposed within the chamber; (iii) a second electrode disposed within the chamber, wherein gas is disposed in an inner space of the chamber between the first electrode and the second electrode; (iv) a radioactive source generating alpha particles within inner space of the chamber; and (v) a magnet coupled to the chamber, where the magnet generates a magnetic field in the inner space of the chamber.

A portable detection apparatus can include a housing, a first detector for detecting ionizing radiation from a first subject and a second detector within the housing for the detecting the background radiation. A shield within the housing can surround the first and second detectors and define a shield aperture around the first and second detectors for radiation from the subject to enter the housing. A radiation blocking member can substantially block at least a portion of the ionizing radiation from reaching the second detector, whereby radiation detected by the second detector comprises substantially only the background radiation. A processor module can be connected to the first and second detectors for determining the amount of ionizing radiation detected by the first detector attributable to secondary radiation.

A radiation area monitor device/method, utilizing: a radiation sensor having a directional radiation sensing capability; a rotation mechanism operable for selectively rotating the radiation sensor such that the directional radiation sensing capability selectively sweeps an area of interest; and a processor operable for analyzing and storing a radiation fingerprint acquired by the radiation sensor as the directional radiation sensing capability selectively sweeps the area of interest. Optionally, the radiation sensor includes a gamma and/or neutron radiation sensor. The device/method selectively operates in: a first supervised mode during which a baseline radiation fingerprint is acquired by the radiation sensor; and a second unsupervised mode during which a subsequent radiation fingerprint is acquired by the radiation sensor, wherein the subsequent radiation fingerprint is compared to the baseline radiation fingerprint and, if a predetermined difference threshold is exceeded, an alert is issued.

A portable detection apparatus can include a housing, a first detector for detecting ionizing radiation from a first subject and a second detector within the housing for the detecting the background radiation. A shield within the housing can surround the first and second detectors and define a shield aperture around the first and second detectors for radiation from the subject to enter the housing. A radiation blocking member can substantially block at least a portion of the ionizing radiation from reaching the second detector, whereby radiation detected by the second detector comprises substantially only the background radiation. A processor module can be connected to the first and second detectors for determining the amount of ionizing radiation detected by the first detector attributable to secondary radiation.

A method for recognizing whether a radiation worker normally wears a personal radiation dosimeter, recognizing a radiation dose and work behavior at a specific time point by integrally analyzing radiation measurement data of a personal radiation dosimeter and motion data of a radiation worker, and helping improvement of work behavior of a radiation worker and improvement of radioactive danger recognition on the basis of such data.

A radiation area monitor device/method, utilizing: a radiation sensor; a rotating radiation shield disposed about the radiation sensor, wherein the rotating radiation shield defines one or more ports that are transparent to radiation; and a processor operable for analyzing and storing a radiation fingerprint acquired by the radiation sensor as the rotating radiation shield is rotated about the radiation sensor. Optionally, the radiation sensor includes a gamma and/or neutron radiation sensor. The device/method selectively operates in: a first supervised mode during which a baseline radiation fingerprint is acquired by the radiation sensor as the rotating radiation shield is rotated about the radiation sensor; and a second unsupervised mode during which a subsequent radiation fingerprint is acquired by the radiation sensor as the rotating radiation shield is rotated about the radiation sensor, wherein the subsequent radiation fingerprint is compared to the baseline radiation fingerprint and, if a predetermined difference threshold is exceeded, an alert is issued.

A wearable neutron detector is disclosed that includes a body attachment portion that is configured to be secured to a portion of a human body. The wearable detector includes a scintillator having a plurality of wavelength optical shifting fibers. One or more light converters are connected with the wavelength optical shifting fibers. A detection circuit is connected with the light converters configured to detect a neutron event. A control unit is connected with the detection circuit. An annunciator is connected with the control unit for generating an enunciation of the neutron event. The electronic components are housed within the body attachment portion.

A portable detection apparatus can include a housing, a first detector for detecting ionizing radiation from a first subject and a second detector within the housing for the detecting the background radiation. A shield within the housing can surround the first and second detectors and define a shield aperture around the first and second detectors for radiation from the subject to enter the housing. A radiation blocking member can substantially block at least a portion of the ionizing radiation from reaching the second detector, whereby radiation detected by the second detector comprises substantially only the background radiation. A processor module can be connected to the first and second detectors for determining the amount of ionizing radiation detected by the first detector attributable to secondary radiation.

A radiofrequency (RF) transmitter site protection system and an RF radiation protection device are provided. The RF radiation protection device includes a control system and a communication module. The control system includes a processor. The communication module is adapted to communicate with a device operable to sense RF radiation and to receive data representative of a level of the RF radiation proximate the RF safety monitoring device from the RF safety monitoring device.