# US 2014/0195167 A1 · Method for evaluating the amount of tritium absorbed by a person after exposure to an environment containing tritium without drawing body fluid

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0195167 A1
- Document ID: US20140195167A1
- Status: Published application
- Kind: A1
- Application number: 14/128,863
- Filed: 2012-06-27
- Published: 2014-07-10
- Earliest claimed: 2011-06-30
- Assignees: Commissariat A L'energie Atomique Et Aux Ene Alt
- Inventors: Christophe Douche
- Web page: https://patentgrep.com/patent/US20140195167A1

## CPC

- G01T 1/02: Dosimeters (G01T1/15 takes precedence)
- G01T 1/178: for measuring specific activity in the presence of other radioactive substances, e.g. natural, in the air or in liquids such as rain water
- G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00)

## Abstract

The invention relates to a method of estimating the tritium dose absorbed by a person exposed to an environment with a tritium atmosphere. Applications of the invention include particularly dosimetric monitoring of tritium in persons exposed to an environment containing a significant amount of tritium during their activities, as is the case for the nuclear industry.

## Claims

### Claim 1

Method for estimating the tritium dose (expressed in Sieverts (Sv)) absorbed by a person after exposure of said person to a tritiated environment for a duration τ (expressed in hours(h), said method comprising the following steps:
a) a step to measure the activity per unit volume of tritium present in said environment (denoted CHTO and expressed in Becquerels per litre (Bq/L));
b) a step to estimate the dose absorbed by said person, using the following relation:
Dose=CHTO×τ×DPUIHTO×1800,
in which:
CHTO is the activity per unit volume of tritium (expressed in Becquerels per litre (Bq/1)) measured in the previous step a); and
DPUIHTO is equal to 1.8×10−11 Sieverts per Becquerel (Sv/Bq).

### Claim 2 (depends on 1)

Method according to claim 1, in which step a) consists of bubbling air from the tritiated environment in a given volume of water in a bubbler at constant rate during said duration τ, measuring the activity of tritium (expressed in Becquerels (Bq)) trapped in said volume of water, and then deducing the activity per unit volume of tritium present in the tritiated environment (denoted CHTO and expressed in Becquerels per litre (Bq/L)) using the following relation:
C
HTO
=
I
HTO
η
×
V
,
in which:
IHTO is the activity of tritium (expressed in Becquerels (Bq)) trapped in the volume of water mentioned above;
η is the efficiency at which tritium is trapped in this volume of water; and
V is the volume of air (expressed in litres (L)) that circulated in the above-mentioned volume of water.

### Claim 3 (depends on 2)

Method according to claim 2, in which η is between 0.8 and 1.