Dose

[ramesh]

Reference 1. White, S.C.: 1992 Assessment of Radiation Risk from Dental
Radiography.Dentomaxillofac.Radiol. 21:118-126,August, 1992.
Average E for panoramic radiography in this article is cited as 6.7 microSv
in Table X.In Table XI, equivalent background radiation time is 12 hours.
These are the numbers I have used in teaching/consultations during the past
several years. I think this is an excellent review article. Those of you who
have not read this  article, you may want to seek it out.

Reference 2. Sources and Effects of Ionizing Radiation. UNSCEAR 2000 Report
to the General Assembly. Volume 1: Sources. Table 23, page 388.
Effective dose, single panoral film:
Rare-earth intensifying screens: 7 microSv
Calcium tungstate intensifying screens: 14 microSv.

Chest radiography, mean effective dose:Table 20,page 386
PA:7-17 microSV, with lung filter: 8-11 microSv
CT:0.1-0.15 mSv
DigitalImage Intensifier:13-16 microSv

Chest radiography,mean entrance surface dose: Table 20
PA:0.168 mGy
CT:0.68-1.7 mGy
Digital Image Intensifier: 0.11-0.15 mGy

Ramesh Kuba


-----Original Message-----
From: Oral Radiology Discussion Group
[mailto:ORADLIST at listserv.ucla.edu]On Behalf Of P.N. HIRSCHMANN
Sent: Wednesday, September 18, 2002 9:45 AM
To: ORADLIST at listserv.ucla.edu
Subject: Re: Dose


The values cited in the UK are 7 microSv for a panoramic with rare
earth screens and 40 microSv for a chest film. The former value
does not include the salivary glands as a specific organ in the
calculation: Neil does which is why his figure is higher


Date sent:              Wed, 18 Sep 2002 09:24:19 -0400
Send reply to:          Oral Radiology Discussion Group
<ORADLIST at LISTSERV.UCLA.EDU>
From:                   James Pettigrew <pettij at RADIOLOGY.UFL.EDU>
Subject:                Re: Dose
To:                     ORADLIST at LISTSERV.UCLA.EDU

Sharon, You should speak with Neil Fredrikson at Baylor. He wrote that
chapter. I have spoken to him a number of times concerning this issue. I
still am confused. Maybe you will have better luck.

>>> slbrooks at UMICH.EDU 09/17/02 17:39 PM >>>
According to White and Pharoah, 4th ed, page 49, the effective dose
of a pan is 26 microSv and that of a chest film is 80 microSv.

>Can any one let me know what is the average actual and absorbed doses of a
>pan and a chest X-ray utilizing conventional radiography and Lanex
>screens.
>
>Many thanks
>
>= = = = = = = = = = = = = = = = = = = = = = = = = = = =
>
>Neill Serman,  Professor and Head,  BDS  DDS  MS(Rad) FACD
>Division of Oral Radiology,
>School of Dentistry,  Columbia University
>630 West 168 Street, New York, N.  Y. 10032
>
>Telephone  212  305-5674     email   njs2 at columbia.edu
>Fax        718  796-0400

--
*******************************************************************
Sharon L. Brooks, DDS, MS (slbrooks at umich.edu)
Diplomate, American Board of Oral and Maxillofacial Radiology

University of Michigan, School of Dentistry, Ann Arbor, MI 48109-1078
Phone: 734-764-1595     FAX: 734-764-2469
______________________________________________________________________

Peter Hirschmann
Consultant Dental Radiologist
Leeds Dental Institute
Clarendon Way
Leeds LS2 9LU

Tel  +44 (0)113 233 6214
Fax  +44 (0)113 233 6165

______________________________________________________________________