Abstract: A system and methods relating to the detection of unattached radioactive particles. Seismic events are correlated with an increased release of radon and related decay chain products. An apparatus is described for determining the increase in the unattached particles as an indicator for seismic activity. The apparatus may be used with fracking rigs or petrochemical wells to provide controls responsive to predicted seismic events.

Abstract: A system and methods relating to the detection of unattached radioactive particles. Seismic events are correlated with an increased release of radon and related decay chain products. An apparatus is described for determining the increase in the unattached particles as an indicator for seismic activity. The apparatus may be used with fracking rigs or petrochemical wells to provide controls responsive to predicted seismic events.

Abstract: A Rn222 (radon) and Rn220 (thoron) radiation monitor that uses alpha-track detection film in multiple, separate chambers to detect radiation, wherein different diffusion barriers are used in each of the chambers to allow for signal differentiation between the chambers. The signal differentiation allows for differentiation between the levels of thoron and radon in the atmosphere tested. The radiation monitor may have three or four separate chambers, each with an electrically conductive housing and a cap with at least one opening to permit entry of ambient air. Inside each of the housings is an alpha-track detecting film, such as a solid-state nuclear track detector (SSNTD), with a thin electrically conducting cover. In one or more of the chambers is a diffusion barrier and seal placed within the housing to generally isolate the detecting film from thoron radiation in the housing.

Abstract: The present invention relates to a Rn222 (radon) and Rn220 (thoron) radiation monitor that uses alpha-track detection film in multiple, separate chambers to detect radiation. The invention further describes use of different diffusion barriers in each of the chambers to allow for signal differentiation between the chambers. The signal differentiation allows for differentiation between the levels of thoron and radon in the atmosphere tested. In a preferred embodiment of the invention, the radiation monitor has three or four separate chambers, each with an electrically conductive housing and a cap with at least one opening to permit entry of ambient air. Inside each of the housings is an alpha-track detecting film, such as a solid-state nuclear track detector (SSNTD), with a thin electrically conducting cover. In one or more of the chambers is a diffusion barrier and seal placed within the housing to generally isolate the detecting film from thoron radiation in the housing.

Abstract: A compact electrically conductive housing includes a plurality of access ports defined in the top section of the housing to permit radon gas (.sup.222 Rn) to diffuse into the housing. The access ports are covered by a diffusion barrier such as a layer of foam rubber sheet inside the housing. The bottom section of the housing includes an integrally molded, electrically conductive pedestal having three recessed wells therein. Two wells contain a stacked pair of an SSNTD on top of a calcium fluoride TLD. The third well contains the same components, but with the TLD on top of the SSNTD, and the TLD of this stacked pair is pre-dosed with gamma-rays. The pedestal is covered with a film of electrically neutral aluminized MYLAR (polyester film).

Abstract: A compact electrically conductive housing includes a plurality of access ports defined in the top section of the housing to permit radon gas (.sup.222 Rn) to diffuse into the housing. The access ports are covered by a diffusion barrier such as a layer of foam rubber sheet inside the housing. The bottom section of the housing includes an integrally molded, electrically conductive pedestal having three recessed wells therein. Two wells contain a stacked pair of an SSNTD on top of a calcium fluoride TLD. The third well contains the same components, but with the TLD on top of the SSNTD, and TLD of this stacked pair is pre-dosed with gamma-rays. The pedestal is covered with a film of electrically neutral aluminized MYLAR (polyester film). A background protection disc prevents substantial exposure of the SSNTDs to radon radition until the desired measurment period beings, once the monitor reaches the intended measurement site.

Abstract: A passive device for measuring environmental radioactivity employs three radiation detectors enclosed in a small shielded housing. A first radiation detector generates a first signal responsive to an amount of radioactivity produced over a period of time by radioactive gas diffused in the volume of air inside the housing. The first radiation detector includes at least one thermoluminescence dosimeter mounted in close proximity to an electret. A second radiation detector generates a second signal responsive to an amount of environmental gamma radiation over the period of time, and also includes at least one thermoluminescence dosimeter. A third radiation detector generates a third signal indicative of an amount of fading of the second signal over the period of time, the third radiation detector also including at least one thermoluminescene dosimeter having an initially predetermined third signal.