Film badge radiation dosimeter for detecting radon

Claim 2

A radiation detecting apparatus having, in combination, a support having radiation-sensitive recording means adapted selectively to respond to radiation in a region adjacent to the recording means while discriminating against light and other undesired types of radiation, passage means extending laterally outward therefrom in a plurality of directions for permitting the passage of a sample of an external fluid medium carrying a source of said radiation into the said region to produce a recording effect upon the recording means, thereby enabling a measure of the said radiation.

Claim 3

A radiation detecting badge having, in combination, a light-tight holder intermediately provided with a recesS communicating with a plurality of small bore passages extending outward from the recess in a plurality of directions to the exterior of the holder, radiation-sensitive recording means positioned within the holder and adapted selectively to respond to radiation particles from the recess while discriminating against light and other undesired types of radiation, the radiation particles being emitted from a fluid medium carried by diffusion and convection through said bore passages into the recess to produce a recording effect upon the recording means, thereby enabling a measure of the exposure to said radiation.

Claim 4

A radiation detecting badge having, in combination, a light-tight holder intermediately provided with a recesS communicating with a plurality of small bore passages extending outward from the recess in a plurality of directions to the exterior of the holder, radiation-sensitive recording means positioned within the holder and adapted selectively to respond to radiation particles from the recess while discriminating against light and other undesired types of radiation, the radiation particles being emitted from a fluid medium carried by diffusion and convection through said bore passages into the recess to produce a recording effect upon the recording means, thereby enabling a measure of the exposure to said radiation.

Claim 5

A radon and radon daughter product film badge having, in combination, a light-tight holder intermediately provided with a recess communicating with a plurality of small bore passages extending outward from the recess in a plurality of directions to the exterior of the holder, a sheet of alpha-sensitive film positioned within the holder and separated from the said recess by a light-tight window sufficiently thin to permit substantially unimpeded passage of alpha particles from the recess through the window to the film, the alpha emission resulting from the radon gas and the like which has been carried by diffusion and convection through the said bore passages into the recess to produce tracks upon said film, thereby enabling a measure of the exposure to said gas.

Claim 6

A radon and radon daughter product film badge having, in combination, a light-tight holder intermediately provided with a recess communicating with a plurality of small bore passages extending outward from the recess in a plurality of directions to the exterior of the holder, a sheet of alpha-sensitive film positioned within the holder and separated from the said recess by a light-tight window sufficiently thin to permit substantially unimpeded passage of alpha particles from the recess through the window to the film, the alpha emission resulting from the radon gas and the like which has been carried by diffusion and convection through the said bore passages into the recess to produce tracks upon said film, thereby enabling a measure of the exposure to said gas.

Claim 7

Apparatus as claimed in claim 3 and in which the said light-tight window comprises a metalized Mylar sheet covering the film.

Claim 8

Apparatus as claimed in claim 3 and in which the passages comprise a first set extending longitudinally of the holder between its ends and a second set communicating transversely between the first set and the recess.

Claim 9

Apparatus as claimed in claim 5 and in which the passages are provided in one portion of the holder and the film and window in a mating portion.

Claim 10

Apparatus as claimed in claim 5 and in which the first set comprises passages disposed on opposite sides of the recess, and the second set comprises a pair of transverse passages communicating opposite sides of the recess with the separate passages of the first set.

Claim 11

Apparatus as claimed in claim 5 and in which the passages are of the order of substantially 1/16 to 1/8 inch and the recess is substantially cylindrical with a diameter of the order of substantially 1/2 inch.

Claim 12

Apparatus as claimed in claim 3 and in which the passages are disposed to provide a substantially constant flow rate through the recess.

Claim 13

Apparatus as claimed in claim 3 and in which shield means is provided to shield the holder from contaminating products, while permitting free flow through said passages.

Claim 14

Apparatus as claimed in claim 3 and in which the passage means comprises a plurality of longitudinally extending passages and a plurality of transverse passages respectively communicating end and side walls of the holder with said recess.

Claim 15

A dosimeter for radon and radon daughters of a size adapted to be worn on the person, comprising a flat base having a recess in its central portion, a multiplicity of small bores extending outwardly from the periphery of the recess in a plurality of directions to the exterior of the base, whereby circulation of air into and out of said recess is facilitated, a light-tight window mounted above the recess, said window being opaque to visible light and sufficiently thin to permit substantially unimpeded passage of alpha particles, and a removable cover over the window on the side opposite said recess and mounted to define a space for a sheet of film containing an alpha-sensitive emulsion capable of producing permanent visible indications of the presence and the number of alpha particles striking the film.

Claim 16

A dosimeter for radon and radon daughters of a size adapted to be worn on the person, comprising a flat base having a recess in its central portion, a multiplicity of small bores extending outwardly from the periphery of the recess in a plurality of directions to the exterior of the base, whereby circulation of air into and out of said recess is facilitated, a light-tight window mounted above the recess, said window being opaque to visible light and sufficiently thin to permit substantially unimpeded passage of alpha particles, and a removable cover over the window on the side opposite said recess and mounted to define a space for a sheet of film containing an alpha-sensitive emulsion capable of producing permanent visible indications of the presence and the number of alpha particles striking the film.

Claim 17

The invention of claim 12, said cover being pivotally mounted at one end and having latching means at the other.

Claim 18

A radon and radon daughter product film badge having, in combination, a light-tight holder intermediately provided witH a space communicating at its sides with the exterior of the holder, alpha-sensitine detecting means positioned within the holder and separated from the said space by a light-tight window sufficiently thin to permit substantially unimpeded passage of alpha particles from the space through the window to the detecting means, the alpha emission resulting from the radon gas and the like which has been carried at the said sides into the space producing tracks upon said detecting means, thereby enabling a measure of the exposure to said gas.

Claim 19

A radon and radon daughter product film badge having, in combination, a light-tight holder intermediately provided witH a space communicating at its sides with the exterior of the holder, alpha-sensitine detecting means positioned within the holder and separated from the said space by a light-tight window sufficiently thin to permit substantially unimpeded passage of alpha particles from the space through the window to the detecting means, the alpha emission resulting from the radon gas and the like which has been carried at the said sides into the space producing tracks upon said detecting means, thereby enabling a measure of the exposure to said gas.

Claim 20

Apparatus as claimed in claim 14 and in which means is provided for producing a substantially constant flow rate through the said space.

Claim 21

A radon and radon daughter product film badge having, in combination, a holder intermediately provided with a space communicating at its sides with the exterior of the holder, alpha-sensitive detecting means positioned within the holder and over said space to permit substantially unimpeded passage of alpha particles from the space to the detecting means, the alpha emission resulting from the radon gas and the like which has been carried at the said sides into the space producing tracks upon said detecting means, thereby enabling a measure of the exposure to said gas, and means for providing a substantially constant flow rate through the said space.

Claim 22

A radon and radon daughter product film badge having, in combination, a holder intermediately provided with a space communicating at its sides with the exterior of the holder, alpha-sensitive detecting means positioned within the holder and over said space to permit substantially unimpeded passage of alpha particles from the space to the detecting means, the alpha emission resulting from the radon gas and the like which has been carried at the said sides into the space producing tracks upon said detecting means, thereby enabling a measure of the exposure to said gas, and means for providing a substantially constant flow rate through the said space.