ML20204J004

Forwards Cover Ltrs,Revs 810 & 860 to Model DOS-502A Digital Alarm Dosimeter Specs & Recommendations for Operation of Dositec Model DOS-502A.Documents Sent to Users in Nuclear Power Plants,Utils & non-nuclear Facilities

ML20204J004
Person / Time
Site:	Pilgrim
Issue date:	06/04/1986
From:	Hsu S DOSITEC, INC.
To:	Wigginton J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
Shared Package
ML20204H991	List: ML20204H986 ML20204J004
References
NUDOCS 8608080279
Download: ML20204J004 (10)

Text

O -

DOSITEC, INC.

TEL(617)875-8777 120 ALEXANDER STREET P.O. BOX 4744 FRAMINGHAM, M ASSACHUSETTS 01701 Mr. James E. Wigginton June 4, 1986 Senior Reactor Health Physicist US Nuclear Regulatory Commission Div. of Emergency Prep. & Engrg. Resp.

Office of Inspection & Enforcement Mail Stop EWW-507 Washington, DC 20555

Dear Mr. Wigginton:

Thank you very much for giving me the opportunity to discuss the Dositec Model DOS-502A Digital Alarm Dosimeter in your office two weeks ago.

Enclosed please find the three (3) sets of documents listed below which have been sent to all users of the Model DOS-502A:

Set 1 - These documents have been sent to the users in the nuclear power plants and utility companies:

a) cover letter indicating a detection range .,

up to 5 R/hr b) updated Specification Sheet (810 Rev. 5/86) c) Recommendations for Operation.

Set 2 - These documents have been sent to the users in the nuclear power plants and utility companies:

a) cover letter indicating a detection range I up to 5 R/hr b) updated Specification Sheet (860 Rev. 5/86) c) Recommendations for Operation.

Set 3 - These documents have been sent to some users of

-special-ordered DOS-502A in facilities other than

" nuclear power plants:

a) cover letter indicating a detection range up to 1 R/hr b) updated Specification Sheet (810 Rev. 5/86) c) Recommendations for Operation.

If you have further questions concerning this matter, please let me know.

Very truly yours l

80 9 h00 3 - - - M/ =

SamS.Hau,PM.D.

p President SSH/ba l

Enclosures

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DOSITEC, INC.

120 ALEXANDER STREET TEL. (617) 875-8777 P.O. BOX 4744 FRAMINGHAM, MASSACHUSETTS 01701 May, 1986 1

Reference:

Dositec Model DOS-502A Digital Alarm Dosimeter

Dear Customer:

It has come to my attention that some users of the Dositec Model DOS-502A Digital Alarm Dosimeters have used these dosimeters incorrectly.

The DOS-502A is designed to be linear up to 5 R/hr field with a 120% accuracy. They can be custom-made to be linear up to 50 R/hr field with an accuracy of t20% for some specific applications. It is not recommended to use this instrument in the field beyond the calibration range with an accuracy over 120%. .

Please note that the DOS-502A, just like any other dosimetry device, must be source-checked at the highest possiblo field in which the dosimeter will be used.

Enclosed please find an updated Specification Sheet (810 Rev. 5/86) and a " Recommendations for Operation" for DOS-502A. Please insert these two sheets in your Instruction Manual and notify all appropr'iate individuals in your organization to properly use the Dositec Model DOS-502A Digital Alarm Dosimeters.

Very truly yours,

=_

~

Sam S. Hsu, Ph.D.

President SSH/ba Enclosures 4

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6 MODEL DOS-502A DIGITAL ALARM DOSIMETER REV 810 5/86 SPECIFICATIONS Detector Type Solid State Detector - Cadmium Telluride (CdTe)

Radiation Detected X and Gamma Rays Energy Range 100 kev and up Energy Response 1254 100 kev - 1.2 MeV Range 0-9999 mR ,

Display 4 Digit LED Display Accuracy Unless otherwise specified on Data Sheet, linearity '

up to 5 R/hr with 1204 accuracy when calibrated with Cs137 Preset Alarm 4 Screwdriver Adjusted Digital Switches providing setting from 0000 to 9999 mR in increments of 1 mR Alarm Constant Audible Signal when integrated exposure reaches preset radiation level 75 db at 100 cm from the dosimeter Chirping Rate -

One Chirp per mR Battery 9-Volt Alkaline Battery Life Typically 300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br />.

5 Battery Test If pushbutton lights Battery Test LED Lamp, the battery will function adequately for at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> Shock Resistance Detector packaged in rubber l Packaging Anodized Aluminum case Weight (Approx.) 8 ounces Size (Approx.) 2.5 in. x 4 in. x 1 in.

i Clip Attached ALL SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

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RECOMMENDATIONS FOR OPERATION 5/86 DOSITEC MODEL DOS-502A DIGITAL ALARM DOSIMETERS .

1. The instrument should be source-checked prior td us in a radiation field equal to the highest expected field conditions.

2. The instrument should not be used in a radiation field higher than that listed on the data sheet.

3. The instrument is not designed for use in any Nitrogen-16 (N-16) field. Please consult the factory if the instrument is to be used in the'N-16 field.

4. The Rubber Cover should be put on to avoid mechanical shock.

5. Try to minimize the mechanical tapping on the dosimeter.

6. If the instrument has been exposed to high heat, water, chemical, or dropped or subjected to high impact, or any other unusual .,

exposure, the instrument should be source-checked before use to make sure it responds properly.

7. If the instrument is found to be contaminated, it should be decontaminated and then source-checked prior to use to make sure the instrument responds properly.

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JOS  : C, I NC.

120 ALEXANDER STREET TEL. (617) S75-877:

P.O. BOX 4744 FRAMINGHAM, MASSACHUSETTS 01701 May, 1986

Reference:

Dosite.c Mcdel DOS-502A Digital Alarm Dosimeter

Dear Customer:

It has come to my attention that some users of the Dositec Model DOS-502A Digital Alarm Dosimeters have used these dosimeters incorrectly.

The DOS-502A is designed to be linear up to 5 R/hr field with a 20% accuracy. They can be custom-made to be linear up to 50 R/hr field with an' accuracy of 20% for some specific applications. It is not recommended to use this instrument in the field beyond the calibration range with an accuracy over 120%.

Please note that the DOS-502A, just like any other dosimetry device, 's must be source-checked at the highest possible field in which the dosimeter will be used.

Enclosed please find an updated Specification Sheet (860 Rev. 5/86) and a " Recommendations for Operation" for DOS-502A. Please insert these two sheets in your Instruction Manual and notify all apprcpriate individuals in your organization to properly use the Dositec Model DOS-502A Digital Alarm. Dosimeters.

Very truly yours, I

l 2 Sam S. Hsu, Ph.D.

President l

SSH/ba l Enclosures l

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, ,_ _ , _ . y , , , _ _ _ _ - , - . _ , _ _ , ,

6 t

1 4 SPECIFICATIONS MODEL DOS-502A DIGITAL ALARM DOSIMETER RE7 860 5/86 Detector Type Solid State Detector - Cadmium Telluride (CdTe)

Radiation Detected X and Gamma Rays Energy Range 100 kev and up Energy Response 1254 100 kev - 1.2 MeV Range. 0-9999 mR Display 4 Digit LED Display Accuracy Unless otherwise specified on data Sheet, linearity up to 5 R/hr with 120s accuracy when calibrated with Cal 37 i Preset Alarm 4 Screwdriver Adjusted Digital Switches providing setting from 0000 to 9999 mR in increments of 1 mR Alarm Constant Audible Signal when integrated exposure reaches preset radiation level; 75 db at 100 cm from the dosimeter Chirping. Rate One Chirp per mR Battery 9-Volt Alkaline Battery Life Typically 150 hours0.00174 days <br />0.0417 hours <br />2.480159e-4 weeks <br />5.7075e-5 months <br /> Battery Test If pushbutton lights Battery Test LED Lamp, the battery will function adequately for at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> .

Shock Resistance Detector packaged in rubber Packaging Anodized Aluminum case Weight (Approx.) 8 ounces Size (Approx.) 2.5 in. x 4 in. x 1 in.

Clip Attached I

ALL SPECIFICATIONS. ARE SUBJECT TO CHANGE WITHOUT NOTICE.

2 i

t

6 4

RECOMMENDATIONS FOR OPERATION 5/86 DOSITEC MODEL DOS-502A DIGITAL ALARM DOSIMETERS

1. The instrument should be source-checked prior to us in a radiation field equal to the highest expected field conditions.

2. The instrument should not be used in a radiation field higher than that listed on the data sheet.

3. The instrument is not designed for use in any Nitrogen-16 (N-16) field. Please consult the factory if the instrument is to be used in the'N-16 field.

4. The Rubber Cover should be put on to avoid mechanical shock.

5. Try to minimize the mechanical tapping on the dosimeter.

6. If the instrument has been exposed to high heat, water, chemica'1, or dropped or subjected to high impact, or any other unusual exposure, the instrument should be source-checked before use to make sure it responds properly. '.

7. If the instrument is found to be contaminated, it should be decontaminated and then source-checked prior to use to make sure the instrument responds properly.

r t

6 DOSITEC, INC.

120 ALEXANDER STREET TEL (617)875-8777 P.O. BOX 4744 FRAMINGH AM, MASSACHUSETTS 01701 May 1986

Reference:

Dositec Model DOS-502A Digital Alarm Dosimeter

Dear Customer:

It has come to my attention that some users of the Dositec Model DOS-502A Digital Alarm Dosimeters have used these dosimeters incorrectly.

The DOS-502A is designed to be linear up to 1 R/hr field with a 120% accuracy. They can be custom-made to be linear up to 50 R/hr field with an accuracy of 120% for some specific applications. It is not recommended to use this instrument in the field beyond the calibration range with an accuracy over 120%.

Please note that the DOS-502A, just like any other dosimetry device, must be source-checked at the highest possible field in which the dosimeter will be used.

Enclosed please find an updated Specification Sheet (810 Rev. 5/86) and a " Recommendations for Operation" for DOS-502A. Please insert these two sheets in your Instruction Manual and notify all appropriate individuals in your organization to properly use the Dositec Model DOS-502A Digital Alarm Dosimeters.

Very truly yours, Sam S. Hsu, Ph.D.

~~ President SSH/ba Enclosures O

r i

SPECIFICATIONS MODEL DOS-502A DIGITAL ALARM DOSIMETER REV 810 5/86 Detector Type Solid State Detector - Cadmium Telluride (CdTe)

Radiation Detected X and Gamma Rays Energy Range 100 kev and up Energy Response 1254 100 kev - 1.2 MeV Range 0-9999 mR Display 4 Digit LED Display ,

Accuracy Unless otherwise specified on Da'ta Sheet, linearity up to 5 R/hr with 120% accuracy when calibrated with .

Csl37 Preset Alarm 4 Screwdriver Adjusted Digital Switches providing setting from 0000 to 9999 mR in increments of 1 mR Alarm Constant Audible Signal when integrated exposure reaches preset radiation level 75 db at 100 cm from the dosimeter Chirping Rate One Chirp per mR Battery 9-Volt Alkaline Battery Life Typically 300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br />.

Battery Test If pushbutton lights Battery Test LED Lamp, the 5

battery will function adequately for at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> Shock Resistance Detector packaged in rubber Packaging Anodized Aluminum case Weight (Approx.) 8 ounces Size (Approx.) 2.5 in. x 4 in. x 1 in.

Clip Attached 1

1 ALL SPECIFICATIONS ARE SUBJECT TO CHANGE WITNOUT NOTICE.

i

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4 i

- . _ _ . _ . . - _ . _ _ _ . _ _ _ _ _ . _ _ . . _ _ , _ . _ . ~

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RECOMMENDATIONS FOR OPERATION 5/86 DOSITEC MODEL DOS-502A DIGITAL ALARM DOSIMETERS .

1. The instrument should be source-checked prior to us in a radiation field equal to the highest expected field conditions.

2. The instrument should not be used in a radiation field higher than that listed on the data sheet.

3. The instrument is not designed for use in any Nitrogen-16 (N-16) field. Please consult the factory if the instrument is to be used in the'N-16 field.

4. The Rubber Cover should be put on to avoid mechanical shock.

5. Try to minimize the mechanical tapping on the dosimeter.

6. If the instrument has been exposed to high heat, water, chemical, or dropped or subjected to high impact, or any other unusual exposure, the instrument should be source-checked before use to make sure it responds properly. ,

7. If the instrument is found to be contaminated, it should be decontaminated and then source-checked prior to use to.make sure the instrument responds properly.

W 8 .

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