Tuesday, April 8, 2014

Simple Nuclear Decay Formula

Here's how to determine the Activity present after a certain amount of time passes (nuclear decay formula) without having to use the constant e (Euler's number):

A(t) = A(0) * 2 ^ (-t/halflife)

Activity at time "t" =

Activity at time zero


2 raised to the [ (-t) / halflife]

This is much more simple than having to use the constant e


What is the activity after 6 hours for 10 mCi of Tc99m ?

A(t) = the unknown

halflife = 360 minutes for Tc99m

t = 360 minutes

A(0) = 10 mCi

2 raised to the (-360/360) = 2 raised to the -1 = 1/2


A(t) = 10 * 1/2 = 5 mCi

A = Ao * 2 ^ (-t/halflife) 

much more simple!

This is how I was taught in 1993 and it is much more simple than using e 

- Tom Heston 

Friday, March 28, 2014

Hardiness and Happiness

HYPOTHESIS: Hardiness decreases perceived stress and increases happiness in nurses.

METHODS: 252 nurses in Tehran, completed the Personal Views Survey, the Perceived Stress Scale, and the Oxford Happiness Inventory.

RESULTS: Hardiness seemed to decrease perceived stress and increased happiness.

CONCLUSION: The hypothesis is confirmed. Hardiness decreases stress and increases happiness.

J Psychiatr Ment Health Nurs. 2014 Mar 25;

Wednesday, March 19, 2014

How to Beat Breast Cancer

Here are ways to decrease your chances of getting breast cancer, and increasing your odds of good health.
Contributor: Tom Heston MD
Published: Aug 12, 2012
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Mindfulness and acceptance-based behavioral therapies for anxiety disorders.

This article presents a brief conceptual overview of acceptance-based behavioral therapies (ABBTs) for anxiety disorders, followed by a review and summary of the recent efficacy studies of ABBTs for anxiety and comorbid disorders. We discuss clinical implications, including the importance of targeting reactivity and experiential avoidance in interventions for anxiety disorders through the use of mindfulness and other acceptance-based strategies, as well the encouragement of engagement in meaningful activities or valued action. We also address future directions for research, such as expanding research to include more randomized control trials comparing ABBTs for specific anxiety disorders to other active treatments, examining mechanisms of change, exploring adaptations in different care-delivery contexts, as well as determining the applicability of these approaches to clients from marginalized or non-dominant statuses.

Curr Psychiatry Rep. 2013 Nov;15(11):410

Monday, March 17, 2014

A New Definition of Statistical Signifance

P-Values Corrected For Study Power More Accurately Represent Statistical Significance
Contributor: Tom Heston MD
Published: Jan 15, 2013
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The ABC's of Healthy Exercise

This simple and comprehensive exercise program makes setting up a personalized exercise program easy and fast.
Contributor: Tom Heston MD
Published: Dec 10, 2012
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Friday, March 14, 2014

Mindfulness-Based Program for Infertility: efficacy study.

OBJECTIVE: does mindfulness meditation help women with infertility?

DESIGN: Controlled clinical trial.

PATIENTS: Fifty-five infertile women completed the mindfulness program and 37 infertile women were assigned to a control group.

RESULTS: The mindfulness group had significant decreases in depressive symptoms, internal and external shame, entrapment, and defeat. They also had improved self-efficacy to deal with infertility.

CONCLUSIONS: mindfulness therapy is an effective psychological intervention for women experiencing infertility.

Fertil Steril. 2013 Oct;100(4):1059-67