[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: Conversion of Half-life Years to Seconds
Leo
Good question. I have always used 365 days but I could have been wrong. I
looked in Shleien's Third addition and didn't see anything.
John
_________________
John R Johnson, Ph.D.
*****
President, IDIAS, Inc
4535 West 9-Th Ave
Vancouver B. C.
V6R 2E2
(604) 222-9840
idias@interchange.ubc.ca
*****
or most mornings
Consultant in Radiation Protection
TRIUMF
4004 Wesbrook Mall
Vancouver B. C.
V6R 2E2
(604) 222-1047 Ext. 6610
Fax: (604) 222-7309
johnsjr@triumf.ca
-----Original Message-----
From: owner-radsafe@list.vanderbilt.edu
[mailto:owner-radsafe@list.vanderbilt.edu]On Behalf Of Leo M. Lowe
Sent: December 10, 2003 8:52 AM
To: radsafe@list.vanderbilt.edu
Subject: Conversion of Half-life Years to Seconds
I want to calculate relatively precisely the specific activities of
radionuclides with half-lives that are given in units of years. This
requires a conversion from "years" to seconds.
So which "year" should I use: the calendar year (365 days), the mean solar
year (365.24219 days), the sidereal year (365.25636 days), ....? (where 1
day = 24 hours = 86,400 seconds).
Which "year" is used by the standards organizations, such as NIST, when
publishing half-lives?
Regards,
Leo M. Lowe, Ph.D., P.Phys.
Principal, Senior Health and
Environmental Physicist
SENES Consultants Limited
121 Granton Drive, Unit 12
Richmond Hill, Ontario
Canada L4B 3N4
Tel: (905) 764-9380
Fax: (905) 764-9386
llowe@senes.ca
www.senes.ca
This transmission is intended only for the addressee and may contain
PRIVILEGED or CONFIDENTIAL information. Any unauthorized disclosure, use
or retention is strictly prohibited. SENES does not accept liability for
any errors, omissions, corruption or virus in contents or
attachments. Information is provided for use "as is" by the
addressee. Revised documents must not be represented as SENES work
product, without express, written permission of a SENES Director.
************************************************************************
You are currently subscribed to the Radsafe mailing list. To
unsubscribe, send an e-mail to Majordomo@list.vanderbilt.edu Put the
text "unsubscribe radsafe" (no quote marks) in the body of the e-mail,
with no subject line. You can view the Radsafe archives at
http://www.vanderbilt.edu/radsafe/
************************************************************************
You are currently subscribed to the Radsafe mailing list. To
unsubscribe, send an e-mail to Majordomo@list.vanderbilt.edu Put the
text "unsubscribe radsafe" (no quote marks) in the body of the e-mail,
with no subject line. You can view the Radsafe archives at
http://www.vanderbilt.edu/radsafe/