[ RadSafe ] [Non-DoD Source] Re: ] [Radsafe] Caution-news: One worker at Ibaraki facility found with up to 22, 000 becquerels of plutonium in lungs (UNCLASSIFIED)

Thu Jun 8 11:35:44 CDT 2017

Dear all, and Dr. Falo,

I am also interested in understanding how the CED should be interpreted in the graph. If I understand correctly you read the values at 0.1 days after inhalation, i.e. shortly after the time of the inhalation. For each Bq of Pu-239 a given dose is given.
If instead an estimate of the present activity is made 10 days after the event then the value at 10 days is used, taking into account the dose up to that time and the fact that the activity at the time of the intake was higher than now.
Is this a correct interpretation?

Best wishes,
Mattias Lantz

________________________________
From: radsafe-bounces at health.phys.iit.edu <radsafe-bounces at health.phys.iit.edu> on behalf of Kulp, Jeffrey (DOH) <Jeffrey.Kulp at DOH.WA.GOV>
Sent: 08 June 2017 17:17:26
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] [Non-DoD Source] Re: ] [Radsafe] Caution-news: One worker at Ibaraki facility found with up to 22, 000 becquerels of plutonium in lungs (UNCLASSIFIED)

Hello Dr. Falo,

Over what period of time is the dose of 12.2 Sv delivered to the lungs?

Thanks,

Jeffrey Kulp, RRPT
Radiation Health Physicist
Washington State Department of Health - ORP
16201 E. Indiana Ave. Suite 1500
Spokane Valley, WA 99216
(509) 329-2138 (Office)
(509) 329-2154 (Fax)
"Public Health - Always Working for a Safer and Healthier Washington"

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Falo, Gerald A CIV USARMY MEDCOM APHC (US)
Sent: Thursday, June 8, 2017 7:12 AM
To: The International Radiation Protection (Health Physics) Mailing List <radsafe at health.phys.iit.edu>
Subject: Re: [ RadSafe ] [Non-DoD Source] Re: ] [Radsafe] Caution-news: One worker at Ibaraki facility found with up to 22, 000 becquerels of plutonium in lungs (UNCLASSIFIED)

Classification: UNCLASSIFIED
Caveats: NONE

All,

I used the online version of the MONDAL3 (http://www.nirs.qst.go.jp/db/anzendb/RPD/mondal3.php).

For an inhalation of Type M (unspecified compounds), one-day after intake, and retention in the lung, I got the following values.

                Retention/Excretion             Committed effective dose per measured activity (Sv/Bq)
0.1micron                3.01E-01                                 3.654E-4
0.3micron                1.53E-01                                 3.856E-4
1 micron                 1.09E-01                                 4.312E-4
3 micron                 8.17E-02                                 5.018E-4
5 micron                 5.76E-02                                 5.556E-4
10micron                 2.64E-02                                 7.576E-4

For 5 um and a lung content of 22,000 Bq, the CED is 12.2 Sv.

************
Note about MONDAL3.

"MONDAL3" is a PC based software that will help users to estimate intake of radionuclides inhaled or ingested by workers or by members of the public and resulting committed effective dose based on measurement results of individual monitoring such as in vivo counting or bioassay measurement.
"MONDAL3" is a free software. If you would like to receive it, please send an e-mail to mondal at qst.go.jp"
************

Jerry

__________________________
Gerald A. Falo, Ph.D., CHP
U.S. Army Public Health Center - Health Physics Division
gerald.a.falo.civ at mail.mil
gerald.a.falo.civ at mail.smil.mil
Comm: 410-436-4852
DSN: 584-4852

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Jaro Franta
Sent: Thursday, June 08, 2017 7:37 AM
To: 'The International Radiation Protection (Health Physics) Mailing List'
Subject: [Non-DoD Source] Re: [ RadSafe ] ] [Radsafe] Caution-news: One worker at Ibaraki facility found with up to 22, 000 becquerels of plutonium in lungs

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----

The article states that "The agency estimates that the amount of radiation exposure of the man with the highest level translates to up to 12 sieverts over 50 years."

It doesn't say what that 12 Sv applies to - effective body dose, or dose to a particular organ.

So I looked at some Rad Toolbox calcs for inhalation of 22kBq of Pu239 (slow systemic transfer - 'S' or 'Y' case)

Caution-https://www.dropbox.com/s/u2uxiwr778347tv/22kBq_Pu239_dose_RadToolbox.JPG

Interesting to compare to Radium dial painters data - where no malignancies were seen below 3700 kBq (0.1mCi) of INGESTED activity.
Ingestion is of course a very different pathway, but Rad Toolbox calculates that, while the bone surface dose is much higher for the Ra226 ingestion case, the effective body dose is similar to inhalation of 22kBq of Pu239.

Caution-https://www.dropbox.com/s/xsav1daxx34zdbm/3700kBq_Ra226_ingestion_dose_RadTo
olbox.JPG

Caution-https://www.dropbox.com/s/xsk8c7agv5ulney/Radium_dial_painters_graphic.jpg

 Jaro
^^^^^^^^^^^^^^^^^^^^^^^^^

On Wed, Jun 7, 2017 at 4:30 PM, Nick Tsurikov <nick.tsurikov at gmail.com>
wrote:
> Dear all,
> The full article in Japan Today:
>
Caution-https://japantoday.com/category/national/5-workers-suffer-radiation-exposure
-one-with-up-to-22-000-becquerels-of-plutonium-in-his-lungs
> Kind regards
> Nick
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