General Information

Serial #

N/A

Part Number

1

Total Parts

7

AKA

radiation reader TLD R-1

Patents

N/A

General Description

Grey painted metal cabinet has black trim and minor fittings; 4 grey synthetic castors have silver metal housings; silver metal locks; silver metal and brass (?) hardware; black and grey synthetic covering on bundled power cords.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

73.0 cm

Width

44.0 cm

Height

150.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Medical Technology

Category

Radiology

Sub-Category

N/A

Manufacturer

AKA

EDA

Country

Canada

State/Province

Ontario

City

Toronto

Context

Country

Canada

State/Province

Ontario

Period

This system used c. early 1970s- c. 2005.

Canada

Canadian designed and built technology. The original design for this reader was done at AECL, Chalk River, Ont. by Bill Brennan [engineer] in late 1960s- early 1970s. Health Canada saw the reader in use there, made some minor design changes, and had 5 built by E.D.A., Toronto for use in Ottawa by it's Radiation Protection branch. The National Dose Registry (NDR) is a centralized radiation dose record system, operated by the Radiation Protection Bureau (RPB) of Health Canada. It contains the occupational radiation dose records of all monitored radiation workers in Canada from the 1940s to the present [2005]. [Ref. 1]

Function

Specific: To observe the amount of radiation exposure recorded on a plaque-style dosimeter.

Technical

Canadian radiation monitoring operation was the sole user of this type of plaque and reader. Identified as "System 1", this equipment arrangement included a reader using a Cybernex terminal/monitor [.3] with semi-direct buffers connected to the main frame computer. It also used a Linear small chart recorder [.5] and a Epsom MX-80 printer [.6]. [Ref. 1] This reader [system] used for larger or regular plaques. The plaque used was a small aluminium plate cut to shape, with two holes cut in one where a special tape covers the hole and a radiation sensitive chip is stuck to the tape in the centre of the hole. The user wears the plaque in a dedicated holder on their person. After working around radiation sources for a specific length of time, the plaque was sent to NDS for reading. [Ref. 1]

Area Notes

Unknown

Details

Markings

" [logo]/ Automatic T.L.D. Reader/ AEP 5256A C.R.N.L. 4764" printed on plate fixed to front cabinet access door. "1" printed by hand on white paper label secured by adhesive tape to casing. "187" printed by hand in pencil on small, round orange paper label applied to upper right front corner of casing. Health Canada inventory decal bears bar code and printed text "15500226". White paper label fixed to upper right of casing reads "[Se]cond, (reader operators), the normal patch profile should now utilize the following arrangements of/ unexposed and exposed elements: / Beginning/ Unexposed/ 2/ Exposed/ 3/ Interruption/ [Unexposed]/ 1/ [Exposed]/ 2/ Restart/ [Unexposed]/ 1/ [Exposed]/ 2/ End/ [Unexposed]/ 2/[ Exposed]/ 3/ High Readings/ [Unexposed]/ 0/ [Exposed]/ 1/ Third, acceptable readings from unexposed standards (used to determine dial out) [illegible] [s]hould be as/ follows:/ Thick Chip/ Individual Value/ 15-35/ Average/ 20-30/ Thin Chip/ [Individual Value]/ Average/ 4-9/ Bkdg Thick/ Average/ 450- 550 std's/ calculated/ RAW x S.T./ If any problems are encountered with achieving these values, please see me before proceeding". "DATA/ TEMP" printed by hand in ink, then struck through with pencil, on label applied to casing side panel. "HEALTH PROTECTION BRANCH/ ASSET No. 32880/ DIRECTION GÉNÉRAL DE LA/ PROTECTION DE LA SANTÉ" printed on blue label applied to upper right corner of cabinet.

Missing

Unknown.

Finish

Grey painted metal cabinet has black trim and minor fittings; 4 grey synthetic castors have silver metal housings; silver metal locks; silver metal and brass (?) hardware; black and grey synthetic covering on bundled power cords.

Decoration

Atomic Energy Canada (?) logo appears on plate.